Young people are already leading on climate action. I see it at rallies to reject the Keystone XL dirty tar sands pipeline. I see it in the push to demand justice for communities being run over by fracking operations.

The more people learn about the proposed Keystone XL tar sands pipeline, the worse it looks.

The Keystone XL pipeline is a threat to our nation. It would increase pollution and intensify climate change for generations to come. We must raise our voices and demand our leaders reject this dirty scheme.

I have been fighting climate change for two decades, and people often ask me how I remain hopeful in the face of extreme weather and grim forecasts. The answer is simple: I see countless solutions spreading across the nation and across the world. But we need more investment.

I have visited people whose health has been endangered by tar sands oil. I have watched neighbors struggle to recover from Superstorm Sandy. I have seen solar panels and wind turbines become an increasingly familiar part of the landscape.

Business leaders, social justice groups, farmers and ranchers, doctors and nurses and people from all walks of life are concerned about the climate threat.