Scientists said the concentration of carbon dioxide, which contributes to climate change, is the highest in data going back 800,000 years, based on ice core records.
Allison Crimmins, who heads the National Climate Assessment, says the U.N.'s landmark report confirms the need for "significant, sustained action" to reduce emissions.
Men spend their money on greenhouse gas-emitting goods and services, such as meat and fuel, at a much higher rate than women, Swedish researchers found.
The amount of carbon dioxide in Earth's atmosphere reached 419 parts per million in May, its highest level in more than four million years, according to NOAA. Fossil fuel use is driving the increase.
Germany's top court rejected some of the activists' arguments but agreed that the country's climate act violates their fundamental rights by not specifying emissions reduction targets after 2030.
Environmental groups and business leaders are pushing President Biden to cut U.S. emissions 50% by 2030. The question is: what kind of climate policies will work that fast?
Heat waves, air pollution and extreme weather are making people sick and, increasingly, killing people. A key report by global physicians says fossil fuels are to blame.
China is investing in both coal and renewable energy, the European Union promises to dramatically reduce carbon emissions and the U.S. is leaving the Paris Agreement altogether. What will 2021 hold?
Gov. Gavin Newsom signed an executive order Wednesday that amounts to the most aggressive clean-car policy in the U.S. and would end the sale of new gas vehicles in the state in 15 years.