Emissions by a company's suppliers and customers could count towards the total.
A new study in the journal Nature Communications says going virtual can reduce an event's carbon footprint by 94%.
"We don't really have a plan without the Build Back Better Act to stop the warming," a UC Santa Barbara professor says.
The tax has been a contentious topic among Washington lawmakers, but the U.S. is behind industrialized nations in not having one in place.
Companies aren't required to share data on their greenhouse gas emissions, which makes it hard for investors to evaluate their own progress toward net-zero portfolios.
Pound for pound, it's 28 times better at trapping atmospheric heat than CO2.
A new study says New York City's bike-share program saved nearly 500 tons of emissions over four years.
Environmental groups argue that the oil-and-gas industry emits nearly twice as much of the greenhouse gas as the agency reports.
The voluntary carbon offsets market is unregulated, with no standard pricing. And offsets may not deliver what they promise.