Keep close to Nature's heart... and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean.

Plans to protect air and water, wilderness and wildlife are in fact plans to protect man.

We could have saved the Earth but we were too damned cheap.

If we want to address global warming, along with the other environmental problems associated with our continued rush to burn our precious fossil fuels as quickly as possible, we must learn to use our resources more wisely, kick our addiction, and quickly start turning to sources of energy that have fewer negative impacts.

If all mankind were to disappear, the world would regenerate back to the rich state of equilibrium that existed ten thousand years ago. If insects were to vanish, the environment would collapse into chaos.

Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority.

There are two problems for our species' survival - nuclear war and environmental catastrophe - and we're hurtling towards them. Knowingly.

Our world faces a true planetary emergency. I know the phrase sounds shrill, and I know it's a challenge to the moral imagination.

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.

Destroying rainforest for economic gain is like burning a Renaissance painting to cook a meal.

One of the most important lessons we can glean from the environmental movement is to 'think globally and act locally.'

We may achieve climate, but weather is thrust upon us.

The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

We are using resources as if we had two planets, not one. There can be no 'plan B' because there is no 'planet B.'

By polluting clear water with slime you will never find good drinking water.

The Chinese have figured out that they have a giant environmental problem. Folks in Beijing, some days, literally can't breathe. Over a million Chinese die prematurely every year because of air pollution.

If people destroy something replaceable made by mankind, they are called vandals; if they destroy something irreplaceable made by God, they are called developers.

The sooner we get started with alternative energy sources and recognize that fossil fuels makes us less secure as a nation, and more dangerous as a planet, the better off we'll be.

If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.

Transparency, accountability and sustainability have become the slogans of the market leaders. Companies carry out environmental and social audits to court the consumer, and even the bluest chips woo organisations such as Greenpeace and Amnesty.

Harmony with land is like harmony with a friend; you cannot cherish his right hand and chop off his left.

A true conservationist is a man who knows that the world is not given by his fathers, but borrowed from his children.

Environmental protection doesn't happen in a vacuum. You can't separate the impact on the environment from the impact on our families and communities.

Good environmental policy is good economic policy.

The environmental crisis is a global problem, and only global action will resolve it.

Environmental protection and economic development are not in conflict. Environmental protection is not a burden but a source for innovation. It can increase competition, create jobs, and lifts the economy.

All is connected... no one thing can change by itself.

Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio.

Environmental groups are not completely against dams. We approve of appropriate development.

Environmentalism is a form of pagan fundamentalism. These green wackos are fanatics like al-Quaida. Just like them.

We'll continue to see more and more brands integrate social causes, charitable components and environmental issues as underlying themes to their campaigns and messaging. Humans connect with humans after all, and brands are using this as a point of connection to engage with their audience, especially charity-minded Generation Y.

There's every reason to think that whatever their political leanings, Americans will be highly receptive to numerous reforms designed to improve health, safety, economic security, environmental quality and democratic self-government - at least if those reforms do not eliminate their freedom of choice.

Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

Ten percent of the big fish still remain. There are still some blue whales. There are still some krill in Antarctica. There are a few oysters in Chesapeake Bay. Half the coral reefs are still in pretty good shape, a jeweled belt around the middle of the planet. There's still time, but not a lot, to turn things around.

They claim this mother of ours, the Earth, for their own use, and fence their neighbors away from her, and deface her with their buildings and their refuse.

It appears to be a law that you cannot have a deep sympathy with both man and nature.

Our globe is under new dramatic environmental pressure: our globe is warming, our ice caps melting, our glaciers receding, our coral is dying, our soils are eroding, our water tables falling, our fisheries are being depleted, our remaining rainforests shrinking. Something is very, very wrong with our eco-system.

There is a muscular energy in sunlight corresponding to the spiritual energy of wind.

The Safe Drinking Water Act, the safety provisions of the Clean Water Acts, the Clean Air Act, the Superfund Law - the gas industry is exempt from all these basic environmental and worker protections. They don't have to disclose the chemicals they use. They don't have to play by the same rules as anybody else.

Develop resilience and be brave. There are days when it is very discouraging. You have to develop personal resilience to environmental things that come along. If you let every single environmental challenge knock you off your game, it's going to be very, very hard.

Biofuels such as ethanol require enormous amounts of cropland and end up displacing either food crops or natural wilderness, neither of which is good.

Economic growth and environmental protection are not at odds. They're opposite sides of the same coin if you're looking at longer-term prosperity.

It's Nixon who created the Environmental Protection Agency. Clean Air and Water Acts. Endangered Species Act. Promoted affirmative action. One could go on and on with Nixon as a New Deal liberal on domestic policy and a hawk, but one with great geo-political skills.

I think the cost of energy will come down when we make this transition to renewable energy.

When we go to the store, we bring home more than food - we bring home traces of broader environmental problems. But we can use our shopping carts and dinner plates to help solve some of those problems.

The most meaningful engine of change, powerful enough to confront corporate power, may be not so much environmental quality, as the economic development and growth associated with the effort to improve it.

No one should be able to enter a wilderness by mechanical means.

The environmental movement does not always have to be about stopping things. It can be about fixing problems.

Advertising is an environmental striptease for a world of abundance.

Fundamentally, if you look at where the environmental issues are coming from, it's all because of humans and our impact on the environment, so while it's true that one individual is not going to sufficiently fix the environment, it is a necessary thing.