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The medical literature tells us that the most effective ways to reduce the risk of heart disease, cancer, stroke, diabetes, Alzheimer's, and many more problems are through healthy diet and exercise. Our bodies have evolved to move, yet we now use the energy in oil instead of muscles to do our work.
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I can't imagine anything more important than air, water, soil, energy and biodiversity. These are the things that keep us alive.
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Some solutions are relatively simple and would provide economic benefits: implementing measures to conserve energy, putting a price on carbon through taxes and cap-and-trade and shifting from fossil fuels to clean and renewable energy sources.
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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.
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Change is never easy, and it often creates discord, but when people come together for the good of humanity and the Earth, we can accomplish great things.
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The government's desire to expand global trade may be understandable, but we mustn't give away too much. We must tell our elected representatives to at least delay the Canada-China FIPA until it has been examined more thoroughly, and to reconsider the inclusion of investor-state arbitration mechanisms in all trade deals.
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This is suicidal... our home is the biosphere. That's a very thin layer of air, water and land where all life exists. It's fixed, it can't grow, and yet we cling to this idea that the economy can grow forever. And it must. Well, it can't.
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Environmentalism isn't a discipline or specialty. It's a way of seeing our place in the world. And we need everybody to see the world that way. Don't think 'In order to make a difference I have to become an environmentalist.'
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Scientists generally are really chicken about getting involved in some kind of dispute. As a broadcaster, I find it very difficult to urge them, if it is a controversial subject. They don't want to have science being portrayed badly.
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It doesn't give me any satisfaction to think that my concerns will be validated by my grandchildren's generation. I would love to be wrong in everything. My grandchildren are my stake in the near future, and it's my great hope that they might one day say, 'Grandpa was part of a great movement that helped to turn things around.'
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Corporations are not people. They shouldn't be funding. They shouldn't be funding campaigns at all.
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The truth is, as most of us know, that global warming is real and humans are major contributors, mainly because we wastefully burn fossil fuels.
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Scientists have been warning about global warming for decades. It's too late to stop it now, but we can lessen its severity and impacts.
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Faced with the evidence, many deniers have started to admit that global warming is real, but argue that humans have little or nothing to do with it.
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Although it's difficult, if not impossible, to put a dollar value on the numerous services nature provides, leaving them out of economic calculations means they are often ignored.
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One of the joys of being a grandparent is getting to see the world again through the eyes of a child.
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My parents survived the Great Depression and brought me up to live within my means, save some for tomorrow, share and don't be greedy, work hard for the necessities in life knowing that money does not make you better or more important than anyone else. So, extravagance has been bred out of my DNA.
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Our most fundamental social need, it turns out, to my amazement, is love. Now, I'm not a hippie-dippie whatever. If you look at the literature, our most fundamental need for children is an environment of maximum love, and that they can be hugged, kissed, and loved. That's what humanises us and allows us to realise our whole dimension.
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Beyond reducing individual use, one of our top priorities must be to move from fossil fuels to energy that has fewer detrimental effects on water supplies and fewer environmental impacts overall.
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Conserving energy and thus saving money, reducing consumption of unnecessary products and packaging and shifting to a clean-energy economy would likely hurt the bottom line of polluting industries, but would undoubtedly have positive effects for most of us.
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What we are doing is, rather than living on the interest of our basic biological capital, we're using up our capital, so we're dipping into our capital. We're using up what should be our children's and grandchildren's legacy.
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Treaties, agreements and organizations to help settle disputes may be necessary, but they often favor the interests of business over citizens.
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I feel humiliated that I live in a country that demands more already. Why do we cling to the notion that not only must we maintain the current level of consumption, but that it must continue to grow by an exponential factor of 2 to 7 percent every year?
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In the environmental movement, every time you lose a battle it's for good, but our victories always seem to be temporary and we keep fighting them over and over again.