HFCs are much less harmful than the chemicals they replaced, but they have a strong heat-trapping effect that is contributing to global warming.
A hot desert wind is carrying a massive cloud of Saharan dust into the southern United States this week.
The oft-repeated claim that the Amazon rainforest produces 20% of our planet’s oxygen is based on a misunderstanding.
Extreme cold weather can produce unusual phenomena, from so-called sea smoke to slushy ocean waves, caused mainly by the behavior of water at very cold temperatures.
What this study suggests is that the climate is more sensitive to greenhouse gases than we previously thought.