When we go to the store, we bring home more than food - we bring home traces of broader environmental problems. But we can use our shopping carts and dinner plates to help solve some of those problems.

Though every nation must do its part to address climate change, developed nations are responsible for the lion's share of carbon pollution in the atmosphere, and they have an obligation to help developing nations transition to a sustainable future.

VW has held a beloved place in American culture. When I graduated from college, many of my friends drove across the country, and most hit the road in a VW van or Bug. Through the years, these cars have represented youth, freedom and quirkiness.

Our nation has abundant clean energy resources, and tapping them will generate jobs, make the air safer to breathe, and tackle climate change - the greatest environmental crisis of our time.

Climate change deniers would have us believe that oil, gas, and coal are the only ways to power a modern, industrialized society. They are wrong, and the proof is all around us.

California's drought affects everyone in the state, from farmers to fishermen, business owners to suburban residents, and everyone has a role to play in using precious water resources as wisely and efficiently as possible.

Climate change is the central environmental ill of our time. We have an obligation to protect our children from the dangers of this widening scourge, and we aren't yet doing enough about it.

Los Angeles County is one of the most park-poor urban areas in the nation, and the San Gabriel Valley - stretching from Pasadena to Pomona - is especially starved for open space.

As heat rises, so does the number of people trying to cool down homes, schools, hospitals and businesses. This isn't just about comfort; it's a matter of public health.

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.

We'll always need energy. We need to communicate, too, but we're not stuck with hand gestures and smoke signals. There are better ways to power our future than by digging fossil fuel from the ground and setting it on fire.

I have long understood that climate change is not only an environmental issue - it is a humanitarian, economic, health, and justice issue as well.

Wind and other clean, renewable energy will help end our reliance on fossil fuels and combat the severe threat that climate change poses to humans and wildlife alike.

Many environmental battles are won by delaying a destructive project long enough to change the conversation - to allow new economic, political and social dynamics to emerge.

When the government undertakes or approves a major project such as a dam or highway project, it must make sure the project's impacts, environmental and otherwise, are considered. In many cases, NEPA gives the public its only opportunity to be heard about the project's impact on their community.

Los Angeles County is one of the most park-poor urban areas in the nation, and the San Gabriel Valley - stretching from Pasadena to Pomona - is especially starved for open space.