The former veep has been joining other Democrats in calling on the president to get moving on climate change and say no to Keystone XL.
When a climate-skeptic congressman asked how we can be so sure that people are causing climate change, the energy secretary pointed to basic math.
The world population is projected to soar from 7.2 billion today to 8.1 billion in 2025, so you can stop worrying about a shortage of babies.
Solar and wind systems need batteries to store power for when the sun isn't shining or the wind isn't blowing. But why have two devices when you could have just one?
The Justice Department and the state of Arkansas want to make sure ExxonMobil pays up and cleans up after its pipeline spill in Mayflower, Ark.
A five-year-old pipeline sprung a leak and spilled 2.5 million gallons of oily water, wiping out a wide swath of trees and vegetation -- and raising alarms yet again about pipeline safety.
Residents of Lafayette, Colo., are pushing a ballot initiative would prohibit all new oil and gas extraction and establish a far-reaching community bill of rights.
Bt crops are genetically engineered to contain a pesticide, but pests are increasingly developing immunity and munching away, a new study finds.
The head of the U.S. Forest Service recently warned Congress that climate change is prolonging the annual wildfire season. Colorado is feeling the heat.