Humans are an infant species, a mere 150,000 years old. But, armed with a massive brain, we've not only survived, we've used our wits to adapt to and flourish in habitats as varied as deserts, Arctic tundra, tropical rainforests, wetlands and high mountain ranges.

We all live downstream

I can't imagine anything more important than air, water, soil, energy and biodiversity. These are the things that keep us alive.

A book is like a single tree in a forest, in that it exists in conjunction with and because of a great many others around it.

Each of us now has 2.27 kg (5 lbs) of plastic embedded in our bodies.

Many instances of persecution and killing have occurred in countries with atrocious human rights records such as Sri Lanka, Guatemala and the Democratic Republic of Congo.

Other things, like capitalism, free enterprise, the economy, currency, the market, are not forces of nature, we invented them. They are not immutable and we can change them.