Labor, like hunting for meat or planting crops, was eventually traded through currency.
Instead, they are diversifying their incomes by planting crops such and corn and launching side businesses such as coffee tours and shops.
The concept goes like this: Planting crops for biofuels in the U.S. or Europe may cause someone in Brazil or Indonesia to put more earth under the plow.
This may be achieved by increasing the surface reflectivity of the planet, for example by brightening human structures, planting crops with a higher albedo, or covering deserts with reflective material.
That means data from 4, 000 years of preserved corpses shows that serious cardiovascular disease, the leading killer of people in the Western world, has been with us since before we started planting crops.
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With BCAP incentives in place, farmers are much more inclined to make a commitment to planting these crops.
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Most countries were slow to start planting GM crops when they were introduced.
Now he faces a difficult decision of whether to risk further funds by planting spring crops in the fields that remain under snow.
Farmers normally respond to higher food prices by planting more crops.
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It comes just as farmers should be planting their crops for the main growing season, and it is happening in the most fertile part of the country.
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Furthermore, it still hasn't given its approval for the planting of modified crops on EU soil.
Britain's government has been sitting on the fence: it is supposed to decide this year whether to allow the planting of GM crops but has decided to test the waters by launching a nationwide debate, including public meetings and a website.
They are growing different crops, planting trees, harvesting rainwater and growing fodder for livestock to minimize the impacts of climate change.
The Colombian Coffee Federation said its country's high-end growers have begun planting corn and other crops as a way of diversifying incomes, and that most have been reinvesting by replacing old coffee plants with newer, more productive ones.
However, English Nature, the UK Government's wildlife advisor is using the publication of the report to renew its call for a delay in the commercial planting of insect-resistant crops in Britain.
The cool, wet spring in the Midwest delayed planting of the corn and soybean crops and that means pollination of these two crops is happening later in the summer.
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Its ambitious plan calls not only for an end to new planting, but for unprecedented eradication of existing crops.
As for corn, farmers who were able to get into the fields during a soggy planting season in late March and April are seeing their crops in some cases under several feet of water.
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Though GM crops still represent only a fraction of the world's agricultural output, their planting is growing at double-digit annual rates.
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