");vwo_$('head').append(_vwo_sel);return vwo_$('head')[0] && vwo_$('head')[0].lastChild;})("HEAD")}}, R_940895_48_1_2_0:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var ctx=vwo_$(x),el; /*vwo_debug log("Revert","content",""); vwo_debug*/; el=vwo_$('[vwo-element-id="1742919897117"]'); el.revertContentOp().remove();})("HEAD")}}, C_940895_48_1_2_1:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("editElement",".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)"); vwo_debug*/(el=vwo_$(".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)")).html("Hello! David Brancaccio here. Do you want instant access to the free online course - “Economics 101” - to understand basic economic concepts?");})(".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)")}}},rules:[{"triggers":["12454059"],"tags":[{"id":"metric","data":{"campaigns":[{"g":6,"c":39}],"type":"g"},"metricId":0}]},{"triggers":["8536409"],"tags":[{"id":"metric","data":{"campaigns":[{"g":5,"c":48}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":4,"c":54}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":4,"c":61}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":3,"c":62}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":1,"c":16}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":4,"c":64}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":3,"c":39}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":4,"c":55}],"type":"m"},"metricId":959027},{"id":"metric","data":{"campaigns":[{"g":4,"c":63}],"type":"m"},"metricId":959027}]},{"triggers":["12454053"],"tags":[{"data":"campaigns.39","priority":4,"id":"runCampaign"}]},{"triggers":["12454062"],"tags":[{"id":"metric","data":{"campaigns":[{"g":7,"c":39}],"type":"g"},"metricId":0}]},{"triggers":["8459768"],"tags":[{"id":"metric","data":{"campaigns":[{"g":2,"c":48}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":1,"c":54}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":5,"c":61}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":5,"c":62}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":2,"c":16}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":5,"c":64}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":4,"c":39}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":1,"c":55}],"type":"m"},"metricId":951905},{"id":"metric","data":{"campaigns":[{"g":5,"c":63}],"type":"m"},"metricId":951905}]},{"triggers":["12639747"],"tags":[{"id":"metric","data":{"campaigns":[{"g":5,"c":16}],"type":"g"},"metricId":0}]},{"triggers":["8536415"],"tags":[{"id":"metric","data":{"campaigns":[{"g":3,"c":48}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":3,"c":54}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":2,"c":61}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":1,"c":62}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":3,"c":16}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":2,"c":64}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":2,"c":39}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":2,"c":55}],"type":"m"},"metricId":959033},{"id":"metric","data":{"campaigns":[{"g":2,"c":63}],"type":"m"},"metricId":959033}]},{"triggers":["10589191"],"tags":[{"data":"campaigns.48","priority":4,"id":"runCampaign"},{"data":"campaigns.54","priority":4,"id":"runCampaign"},{"data":"campaigns.61","priority":4,"id":"runCampaign"},{"data":"campaigns.62","priority":4,"id":"runCampaign"},{"data":"campaigns.16","priority":4,"id":"runCampaign"},{"data":"campaigns.64","priority":4,"id":"runCampaign"},{"data":"campaigns.55","priority":4,"id":"runCampaign"},{"data":"campaigns.63","priority":4,"id":"runCampaign"}]},{"triggers":["8639604"],"tags":[{"id":"metric","data":{"campaigns":[{"g":1,"c":48}],"type":"m"},"metricId":951908},{"id":"metric","data":{"campaigns":[{"g":5,"c":54}],"type":"m"},"metricId":951908},{"id":"metric","data":{"campaigns":[{"g":1,"c":61}],"type":"m"},"metricId":951908},{"id":"metric","data":{"campaigns":[{"g":4,"c":62}],"type":"m"},"metricId":951908},{"id":"metric","data":{"campaigns":[{"g":6,"c":16}],"type":"m"},"metricId":951908},{"id":"metric","data":{"campaigns":[{"g":1,"c":64}],"type":"m"},"metricId":951908},{"id":"metric","data":{"campaigns":[{"g":5,"c":55}],"type":"m"},"metricId":951908},{"id":"metric","data":{"campaigns":[{"g":1,"c":63}],"type":"m"},"metricId":951908}]},{"triggers":["12454056"],"tags":[{"id":"metric","data":{"campaigns":[{"g":5,"c":39}],"type":"g"},"metricId":0}]},{"triggers":["8536412"],"tags":[{"id":"metric","data":{"campaigns":[{"g":4,"c":48}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":2,"c":54}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":3,"c":61}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":2,"c":62}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":4,"c":16}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":3,"c":64}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":1,"c":39}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":3,"c":55}],"type":"m"},"metricId":959030},{"id":"metric","data":{"campaigns":[{"g":3,"c":63}],"type":"m"},"metricId":959030}]},{"triggers":["75"],"tags":[{"id":"urlChange"}]},{"triggers":["5"],"tags":[{"id":"checkEnvironment"}]},{"triggers":["8"],"tags":[{"priority":2,"id":"groupCampaigns"},{"priority":3,"id":"prePostMutation"}]},{"triggers":["9"],"tags":[{"priority":2,"id":"visibilityService"}]},{"triggers":["2"],"tags":[{"id":"runTestCampaign"}]}],pages:{"ec":[{"1625289":{"inc":["o",["url","urlReg","(?i).*"]]}}]},pagesEval:{"ec":[1625289]},stags:{}}})(); ;;var commonWrapper=function(argument){if(!argument){argument={valuesGetter:function(){return{}},valuesSetter:function(){},verifyData:function(){return{}}}}const getVisitorUuid=function(){if(window._vwo_acc_id>=1037725){return window.VWO&&window.VWO.get("visitor.id")}else{return window.VWO._&&window.VWO._.cookies&&window.VWO._.cookies.get("_vwo_uuid")}};var pollInterval=100;var timeout=6e4;return function(){var accountIntegrationSettings={};var _interval=null;function waitForAnalyticsVariables(){try{accountIntegrationSettings=argument.valuesGetter();accountIntegrationSettings.visitorUuid=getVisitorUuid()}catch(error){accountIntegrationSettings=undefined}if(accountIntegrationSettings&&argument.verifyData(accountIntegrationSettings)){argument.valuesSetter(accountIntegrationSettings);return 1}return 0}var currentTime=0;_interval=setInterval((function(){currentTime=currentTime||performance.now();var result=waitForAnalyticsVariables();if(result||performance.now()-currentTime>=timeout){clearInterval(_interval)}}),pollInterval)}}; var pushBasedCommonWrapper=function(argument){var firedCamp={};if(!argument){argument={integrationName:"",getExperimentList:function(){},accountSettings:function(){},pushData:function(){}}}return function(){window.VWO=window.VWO||[];const getVisitorUuid=function(){if(window._vwo_acc_id>=1037725){return window.VWO&&window.VWO.get("visitor.id")}else{return window.VWO._&&window.VWO._.cookies&&window.VWO._.cookies.get("_vwo_uuid")}};var sendDebugLogsOld=function(expId,variationId,errorType,user_type,data){try{var errorPayload={f:argument["integrationName"]||"",a:window._vwo_acc_id,url:window.location.href,exp:expId,v:variationId,vwo_uuid:getVisitorUuid(),user_type:user_type};if(errorType=="initIntegrationCallback"){errorPayload["log_type"]="initIntegrationCallback";errorPayload["data"]=JSON.stringify(data||"")}else if(errorType=="timeout"){errorPayload["timeout"]=true}if(window.VWO._.customError){window.VWO._.customError({msg:"integration debug",url:window.location.href,lineno:"",colno:"",source:JSON.stringify(errorPayload)})}}catch(e){window.VWO._.customError&&window.VWO._.customError({msg:"integration debug failed",url:"",lineno:"",colno:"",source:""})}};var sendDebugLogs=function(expId,variationId,errorType,user_type){var eventName="vwo_debugLogs";var eventPayload={};try{eventPayload={intName:argument["integrationName"]||"",varId:variationId,expId:expId,type:errorType,vwo_uuid:getVisitorUuid(),user_type:user_type};if(window.VWO._.event){window.VWO._.event(eventName,eventPayload,{enableLogs:1})}}catch(e){eventPayload={msg:"integration event log failed",url:window.location.href};window.VWO._.event&&window.VWO._.event(eventName,eventPayload)}};const callbackFn=function(data){if(!data)return;var expId=data[1],variationId=data[2],repeated=data[0],singleCall=0,debug=0;var experimentList=argument.getExperimentList();var integrationName=argument["integrationName"]||"vwo";if(typeof argument.accountSettings==="function"){var accountSettings=argument.accountSettings();if(accountSettings){singleCall=accountSettings["singleCall"];debug=accountSettings["debug"]}}if(debug){sendDebugLogs(expId,variationId,"intCallTriggered",repeated)}if(singleCall&&(repeated==="vS"||repeated==="vSS")||firedCamp[expId]){return}window.expList=window.expList||{};var expList=window.expList[integrationName]=window.expList[integrationName]||[];if(expId&&variationId&&["VISUAL_AB","VISUAL","SPLIT_URL"].indexOf(_vwo_exp[expId].type)>-1){if(experimentList.indexOf(+expId)!==-1){firedCamp[expId]=variationId;var visitorUuid=getVisitorUuid();var pollInterval=100;var currentTime=0;var timeout=6e4;var user_type=_vwo_exp[expId].exec?"vwo-retry":"vwo-new";var interval=setInterval((function(){if(expList.indexOf(expId)!==-1){clearInterval(interval);return}currentTime=currentTime||performance.now();var toClearInterval=argument.pushData(expId,variationId,visitorUuid);if(debug&&toClearInterval){sendDebugLogsOld(expId,variationId,"",user_type);sendDebugLogs(expId,variationId,"intDataPushed",user_type)}var isTimeout=performance.now()-currentTime>=timeout;if(isTimeout&&debug){sendDebugLogsOld(expId,variationId,"timeout",user_type);sendDebugLogs(expId,variationId,"intTimeout",user_type)}if(toClearInterval||isTimeout){clearInterval(interval)}if(toClearInterval){window.expList[integrationName].push(expId)}}),pollInterval||100)}}};window.VWO.push(["onVariationApplied",callbackFn]);window.VWO.push(["onVariationShownSent",callbackFn])}}; var surveyDataCommonWrapper=function(argument){if(!argument){argument={getCampaignList:function(){return[]},surveyStatusChange:function(){},answerSubmitted:function(){}}}return function(){window.VWO=window.VWO||[];function getValuesFromAnswers(answers){var values=[];for(var i=0;i=timeout;if(toClearInterval||isTimeout){clearInterval(interval)}}),pollInterval)}}window.VWO.push(["onSurveyShown",function(data){commonSurveyCallback(data,argument.surveyStatusChange,"surveyShown")}]);window.VWO.push(["onSurveyCompleted",function(data){commonSurveyCallback(data,argument.surveyStatusChange,"surveyCompleted")}]);window.VWO.push(["onSurveyAnswerSubmitted",function(data){commonSurveyCallback(data,argument.answerSubmitted,"surveySubmitted")}])}}; (function(){var VWOOmniTemp={};window.VWOOmni=window.VWOOmni||{};for(var key in VWOOmniTemp)Object.prototype.hasOwnProperty.call(VWOOmniTemp,key)&&(window.VWOOmni[key]=VWOOmniTemp[key]);;})();(function(){window.VWO=window.VWO||[];var pollInterval=100;var _vis_data={};var intervalObj={};var analyticsTimerObj={};var experimentListObj={};window.VWO.push(["onVariationApplied",function(data){if(!data){return}var expId=data[1],variationId=data[2];if(expId&&variationId&&["VISUAL_AB","VISUAL","SPLIT_URL"].indexOf(window._vwo_exp[expId].type)>-1){}}])})();; ;var vD=VWO.data||{};VWO.data={content:{"fns":{"list":{"args":{"1":{}},"vn":1}}},as:"r5.visualwebsiteoptimizer.com",dacdnUrl:"https://dev.visualwebsiteoptimizer.com",accountJSInfo:{"ts":1743690060,"noSS":false,"pc":{"t":0,"a":0},"rp":30}};for(var k in vD){VWO.data[k]=vD[k]};;var gcpfb=function(a,loadFunc,status,err,success){function vwoErr() {_vwo_err({message:"Google_Cdn failing for " + a + ". Trying Fallback..",code:"cloudcdnerr",status:status});} if(a.indexOf("/cdn/")!==-1){loadFunc(a.replace("cdn/",""),err,success); vwoErr(); return true;} else if(a.indexOf("/dcdn/")!==-1&&a.indexOf("evad.js") !== -1){loadFunc(a.replace("dcdn/",""),err,success); vwoErr(); return true;}};window.VWO=window.VWO || [];window.VWO._= window.VWO._ || {};window.VWO._.gcpfb=gcpfb;;var d={cookie:document.cookie,URL:document.URL,referrer:document.referrer};var w={VWO:{_:{}},location:{href:window.location.href,search:window.location.search},_vwoCc:window._vwoCc};;window._vwo_cdn="https://dev.visualwebsiteoptimizer.com/cdn/";window._vwo_apm_debug_cdn="https://dev.visualwebsiteoptimizer.com/cdn/";window.VWO._.useCdn=true;window.vwo_eT="br";window._VWO=window._VWO||{};window._VWO.fSeg={};window._VWO.dcdnUrl="/dcdn/settings.js";window.VWO.sTs=1743686127;window._VWO._vis_nc_lib=window._vwo_cdn+"edrv/nc-e76f33e8accfa6859749db0f9a4d4230br.js";var loadWorker=function(url){_vwo_code.load(url, { dSC: true, onloadCb: function(xhr,a){window._vwo_wt_l=true;if(xhr.status===200 ||xhr.status===304){var code="var window="+JSON.stringify(w)+",document="+JSON.stringify(d)+";window.document=document;"+xhr.responseText;var blob=new Blob([code||"throw new Error('code not found!');"],{type:"application/javascript"}),url=URL.createObjectURL(blob);window.mainThread={webWorker:new Worker(url)};window.vwoChannelFW=new MessageChannel();window.vwoChannelToW=new MessageChannel();window.mainThread.webWorker.postMessage({vwoChannelToW:vwoChannelToW.port1,vwoChannelFW:vwoChannelFW.port2},[vwoChannelToW.port1, vwoChannelFW.port2]);if(!window._vwo_mt_f)return window._vwo_wt_f=true;_vwo_code.addScript({text:window._vwo_mt_f});delete window._vwo_mt_f}else{if(gcpfb(a,loadWorker,xhr.status)){return;}_vwo_code.finish("&e=loading_failure:"+a)}}, onerrorCb: function(a){if(gcpfb(a,loadWorker)){return;}window._vwo_wt_l=true;_vwo_code.finish("&e=loading_failure:"+a);}})};loadWorker("https://dev.visualwebsiteoptimizer.com/cdn/edrv/worker-1135852b6bc11a94eb64017a8d120ad8br.js");;var _vis_opt_file;var _vis_opt_lib;if(window.VWO._.allSettings.dataStore.previewExtraSettings!=undefined&&window.VWO._.allSettings.dataStore.previewExtraSettings.isSurveyPreviewMode){var surveyHash=window.VWO._.allSettings.dataStore.plugins.LIBINFO.SURVEY_DEBUG_EVENTS.HASH;var param1="evad.js?va=";var param2="&d=debugger_new";var param3="&sp=1&a=940895&sh="+surveyHash;_vis_opt_file=vwoCode.use_existing_jquery&&typeof vwoCode.use_existing_jquery()!=="undefined"?vwoCode.use_existing_jquery()?param1+"vanj"+param2:param1+"va_gq"+param2:param1+"edrv/va_gq-a062e7c4223b2b89f5cddb5055816677br.js"+param2;_vis_opt_file=_vis_opt_file+param3;_vis_opt_lib="https://dev.visualwebsiteoptimizer.com/dcdn/"+_vis_opt_file}else if(window.VWO._.allSettings.dataStore.mode!=undefined&&window.VWO._.allSettings.dataStore.mode=="PREVIEW"){ var path1 = 'edrv/pd_'; var path2 = window.VWO._.allSettings.dataStore.plugins.LIBINFO.EVAD.HASH + ".js"; ;_vis_opt_file=vwoCode.use_existing_jquery&&typeof vwoCode.use_existing_jquery()!=="undefined"?vwoCode.use_existing_jquery()?path1+"vanj"+path2:path1+"va_gq"+path2:path1+"edrv/va_gq-a062e7c4223b2b89f5cddb5055816677br.js"+path2;_vis_opt_lib="https://dev.visualwebsiteoptimizer.com/cdn/"+_vis_opt_file}else{_vis_opt_file=vwoCode.use_existing_jquery&&typeof vwoCode.use_existing_jquery()!=="undefined"?vwoCode.use_existing_jquery()?"edrv/vanj-55389bda300ad24b514d62f335aa126abr.js":"edrv/va_gq-a062e7c4223b2b89f5cddb5055816677br.js":"edrv/va_gq-a062e7c4223b2b89f5cddb5055816677br.js"}window._vwo_library_timer=setTimeout((function(){vwoCode.removeLoaderAndOverlay&&vwoCode.removeLoaderAndOverlay();vwoCode.finish()}),vwoCode.library_tolerance&&typeof vwoCode.library_tolerance()!=="undefined"?vwoCode.library_tolerance():2500),_vis_opt_lib=typeof _vis_opt_lib=="undefined"?window._vwo_cdn+_vis_opt_file:_vis_opt_lib;var loadLib=function(url){_vwo_code.load(url, { dSC: true, onloadCb:function(xhr,a){window._vwo_mt_l=true;if(xhr.status===200 || xhr.status===304){if(!window._vwo_wt_f)return window._vwo_mt_f=xhr.responseText;_vwo_code.addScript({text:xhr.responseText});delete window._vwo_wt_f;}else{if(gcpfb(a,loadLib,xhr.status)){return;}_vwo_code.finish("&e=loading_failure:"+a);}}, onerrorCb: function(a){if(gcpfb(a,loadLib)){return;}window._vwo_mt_l=true;_vwo_code.finish("&e=loading_failure:"+a);}})};loadLib(_vis_opt_lib);VWO.load_co=function(u,opts){return window._vwo_code.load(u,opts);};;;}}catch(e){_vwo_code.finish();_vwo_code.removeLoaderAndOverlay&&_vwo_code.removeLoaderAndOverlay();_vwo_err(e);window.VWO.caE=1}})();

New carbon capture methods offer hopeful outlook for addressing climate change

Feb 20, 2023
One startup's method relies on the same natural process that pulls CO2 out of the air to create limestone.
To make progress against climate change, we'll need to invest in technologies that pull carbon dioxide out of the air,  in addition to reducing global greenhouse gas emissions.
Sean Gallup/Getty Images

There isn't enough space for all of the trees companies want to plant

Nov 8, 2021
By one estimate, the pledges out there already would require a forest five times the size of India.
New research by Oxfam indicates that there may not be enough room to plant all the trees proposed in corporate climate pledges. Above, native birch trees grow next to a desert of volcanic sand in Iceland.
Sean Gallup via Getty Images

Emissions offsets ease travel guilt, but do they reduce carbon footprints?

Aug 17, 2021
The voluntary carbon offsets market is unregulated, with no standard pricing. And offsets may not deliver what they promise.
Though eco-conscious flyers may pay to offset their emissions, experts say a better way to reduce your carbon footprint is to fly or drive less.
Chandan Khanna/AFP via Getty Images

Delta wants to be the first carbon neutral global airline

Feb 14, 2020
Cleaner jet fuels and electric planes are still decades away, meaning Delta is focusing on carbon offsets.
Delta Airlines plans to be carbon neutral by purchasing carbons offsets.
Mario Tama/Getty Images

One Texas non-profit's idea to help curb climate change

Apr 1, 2019
Landowners would pay to “store” carbon.
Texas Coastal Exchange says preserving coastal marshland could be key to battling climate change.
Travis Bubenik for Marketplace

My annual offset disappointment

Jan 4, 2010
In the last week of the year, I have a ritual of calculating my carbon footprint and buying offsets....

For public good, not for profit.