I've always been more interested in organisms that can move on their own than in stationary plants. But when I canoe or hike along the edge of lakes or oceans and see trees that seem to be growing out of rock faces, I am blown away. How do they do it?

The failure of world leaders to act on the critical issue of global warming is often blamed on economic considerations.

The future doesn't exist. The only thing that exists is now and our memory of what happened in the past. But because we invented the idea of a future, we're the only animal that realized we can affect the future by what we do today.

If America wants to retain its position as a global power, its president must listen to the people and show strong leadership at this turning point in human history.

Everyone except the far right wing of the Republican Party realizes that oil, gas and coal burning are the main activities that have sent the climate into bigger floods, droughts, hurricanes, and El Ninos.

I used to work in public health, and the issues were sustainability, how the funds were being delineated, and if the funds were actually helping the people we think they're helping.

Maybe more climate activists will think about the climate change not as an international problem to be resolved in an air-conditioned meeting hall, but as a guerilla war to be fought in the streets.

I was part of Environment Canada's work to stop acid rain, create national parks, clean up the Great Lakes, develop new environmental legislation and negotiate the treaty that saved the ozone layer.