Carbon dioxide makes up less than one-twentieth of 1% of Earth's atmosphere. How does this relatively scarce gas control Earth's thermostat?
After eight weeks free from drought and abnormally dry conditions, Colorado is again seeing the spread of drought.
We have all the technologies needed to make the electric grid run on renewables and lower pollution. What are they and what are the barriers to adopting them widely?
Is it fact or fantasy? Could adding dust to the atmophere help with climate change?
If the Amazon rainforest functions as our planet's lungs, what do raging wildfires threaten? An atmospheric scientist explains why the fires, though devastating, won't suffocate life on Earth.
Abnormally dry conditions increase again in Colorado, while this spring's heaving snowmelt helped slightly downstream.
Consecutive years with snow drought conditions will become much more common, with impacts on cities, agriculture, forests, wildlife and winter sports.
Colorado's historic 8-week stretch free from drought and abnormally dry conditions has ended.
Reducing air travel may have a positive effect on climate change but it will inevitably damage developing countries that rely on tourism for their chances of prosperit.
Major storms can leave thousands of homes damaged or destroyed. It can take years to recover and rebuild - if at all.