The first Arbor Day in the world was celebrated in the small Spanish village of Villanueva de la Sierra in 1805.
Scientists have linked a swarm of small earthquakes west of Fort Worth, Texas, to nearby natural gas wells and wastewater injection.
On Earth Day 2015, humanity faces increasing environmental dangers, but movements to solve the issues are growing.
Activists from across the U.S. met Apr. 18 to convene the Populism 2015 Conference for "Building a Movement for People and the Planet."
Earth Day encourages all citizens to help protect our environment and contribute to a healthy, sustainable world.
"California water policy, water management, and infrastructure need to be changed: those systems were built in an old climate and the reality is, we're in a new climate."
On this day in 2010, a BP oil rig exploded in the Gulf of Mexico, resulting in the largest offshore oil spill in U.S. history.
"It's all well and good that the wealthy are having their lawns painted green, but that's not a solution."
Grijalva, who chairs the congressional committee and is a member of the Progressive Caucus, said, "40 years of environmental policy issues are under attack."
This is the science of climate change. It is no longer up for debate.