Levels of chlorine, which is also toxic at low concentrations, reached 40 times the average. The spiking levels underscore the added danger from wildfires when cars, homes, and other structures ...

Carbon dioxide in the atmosphere is increasing at rates that are incompatible with staying below 1.5 degrees Celsius (2.7 degrees Fahrenheit) of global warming, a Met Office study warns.

Concentrations of carbon dioxide (CO2) are now more than 50% higher than before humans started burning large amounts of fossil fuels. Last year, fossil fuel emissions were at record highs ...