But human borders mean nothing to air, water, windblown soil or seeds or migrating fish, birds or mammals.

Salmon farming-the placement of large metal or mesh net cages in the ocean to grow fish-was pioneered in Norway in the 1960s. Since then, the industry has expanded to Scotland, Ireland, Canada, the US, and Chile, but is dominated by the same multinational corporations. Wherever it is practiced, net-cage salmon farming is controversial and raises serious environmental concerns.

How you imagine the world determines how you live in it.

With an estimated population of nine billion people by 2050, we cannot continue to consume resources at the same rate and maintain our quality of life.

Over and over, we hear politicians say they can't spend our tax dollars on environmental protection when the economy is so fragile.

If we want to move towards a low-polluting, sustainable society, we need to get consumers to think about their purchases.

Fukushima is the most terrifying situation I can imagine.