Unlike the situation the world faced in 2009, the tools to combat climate change are now affordable, well established and are being deployed around the globe at a pace never before seen.
Making the transition to zero carbon in our economies and societies is an imperative, but we can only succeed if the transition is just.
As the summit that everyone in the climate world has been pointing to as the "last best chance to change course" gets underway, there is good news and there is bad news.
If we are serious about changing the climate, we need to get serious about changing agriculture.
As President Obama flies to Paris for the latest international negotiation on climate change, diplomats on both sides of the Atlantic appear confused about what his position will be. Will he champion legally binding commitments by all nations to reduce their greenhouse gas emissions? Or will he agree only to deal with no legal force?
The scientific community agrees on a crucial fact: we must leave most remaining fossil fuels in the ground, or our children and future generations are screwed. Yet Obama is not proposing the action required for the essential change in energy policy direction.
Virtually every player at the Paris conference fully understands the grotesque extremism gripping the GOP. It is an embarrassing spectacle, unique among world powers. But the embarrassment is trivial. More than ever, the stakes involved in U.S. leadership are the highest conceivable.
The power of the film is that it won't let us forget that it's within our power to avoid the worst consequences of climate change -- we need only choose to do so. That's important for all of us to remember, not just those who are tasked with reaching an agreement in Paris.
When we think of climate change, we tend to picture rising sea levels, higher temperatures, expanding deserts, more violent storms, melting ice caps. But we should also think of wasted fields and hungry people, because climate change poses a tremendous threat to our food supply for all countries.
Sometimes, a crisis strikes without warning. Sometimes, however, a crisis gathers more slowly and incrementally. Climate change is already a daily reality for my people, but without urgent global action to curb emissions, this growing crisis will spiral out of control.
This turkey day we gather around the steaming food to defend ourselves against what is outside. We are seated facing inward, admiring the steaming aroma of the overkill. We pretend for an hour that we don't notice what is behind us, the climate rattling the windows and the families knocking on our door.
In the fear-filled atmosphere that has broken hearts and led spirits to despair, many people are nervous about attending COP21 and afraid of the future. Some politicians try to use this attack to close their countries' doors to refugees.
Once you see how vulnerable my community is to sea-level rise and erosion, you won't be able to deny that climate disruption is real.
While data suggests that 2015 will likely go down as the hottest year on record, this has also been a year when we've made extraordinary environmental progress in five key areas. We have the numbers to prove it.
Elephant experts, conservationists, animal advocates, and thoughtful people everywhere know that wildlife belongs in the wild and that we have a responsibility to do everything we can to keep them there.
This Monday, animal advocates released a shocking investigation showing widespread cruelty at what some would consider the most unlikely of places -- a top-rated Whole Foods turkey supplier.
When the Rana Plaza factory collapsed over 1,129 people were killed. Horrific manufacturing conditions aside, the way fashion is marketed to women is damaging to say the least. Through images we are taught that as women our looks our everything and the best way to look is skinny young and white.