If you want psychic gratification, one of the greatest ways is to know that you've made a real contribution to saving a species from blinking out during your lifetime.

Getting to the point where a cause goes from being a terribly daunting task with a handful of adherents to an acknowledged success with momentum and many allies is a rarity.

Whatever you are doing in life, you have to build a high-class vehicle to deliver your vision.

I am a businessman because I am good at business. But big cats are my first love.

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 mammoth was basically done in by climate change. The last ones survived on Wrangel Island, north of Chukotka, until 3,700 years ago. According to Eveny mythology, mammoths scooped up dirt with their tusks to form the first dry land.

Saving our planet, lifting people out of poverty, advancing economic growth... these are one and the same fight. We must connect the dots between climate change, water scarcity, energy shortages, global health, food security and women's empowerment. Solutions to one problem must be solutions for all.

The language 'It's too late' is very unsuitable for most environmental issues. It's too late for the dodo and for people who've starved to death already, but it's not too late to prevent an even bigger crisis. The sooner we act on the environment, the better.