The combination of pictures and words together can be really effective, and I began to realise in my career that unless I wrote my own words, then my message was diluted.

Ever since the 1860s when photographers travelled the American West and brought photographs of scenic wonders back to the people on the East Coast of America we have had a North American tradition of landscape photography used for the environment.

The landscape is like being there with a powerful personality and I'm searching for just the right angles to make that portrait come across as meaningfully as possible.

If we limit our vision to the real world, we will forever be fighting on the minus side of things, working only too make our photographs equal to what we see out there, but no better.

We can be thankful President Barack Obama is taking aim at one of the prime causes of climate change and extreme weather: air pollution. The EPA's carbon pollution standards are the most significant step forward our country has ever taken to protect our health by addressing climate change.

We will never end poverty if we don't tackle climate change.

A slight daily unconscious luxury is hardly ever wanting to the dwellers in civilization; like the gentle air of a genial climate, it is a perpetual minute enjoyment.

The trends that are shaping the twenty-first-century world embody both promise and peril. Globalization, for example, has lifted hundreds of millions of people out of poverty while contributing to social fragmentation and a massive increase in inequality, not to mention serious environmental damage.