They dole out payment to the filmmakers as shooting progresses and then sell credits to the public after it is over.
By letting them sell credits to companies in rich countries which, in turn, can use them to offset their own pollution.
Planktos had announced that it would dump tons of iron dust in the ocean to spark the growth of phytoplankton, and then sell credits based on how much carbon the phytoplankton consumed.
Mumbai, for one, plans to sell such credits when its landfill-gas project at Gorai comes on stream.
And at least one private firm has come in for criticism for attempting to sell carbon credits based on ocean fertilisation.
It was when the Kyoto accord was first signed in 1997 that George started thinking of new ways to sell carbon credits and started researching iron fertilization.
Among other initiatives, it has launched a stormwater credit market, whereby developers and property owners subject to tougher new stormwater management regulations can buy and sell stormwater credits.
That could be a carbon tax or a cap-and-trade system, such as Europe's Emissions-Trading Scheme, which limits how much producers can emit, and lets them buy and sell emissions credits.
The bill being proposed would reduce nationwide greenhouse gas emissions 17 percent by 2020 and 83 percent by 2050 through a so-called "cap-and-trade" program under which companies would buy and sell emissions credits.
Countries that can prove they store carbon, such as via their forests, can sell these credits on the market to businesses that have exceeded the agreed cap on their own allowable carbon emissions.
The White House is trying to fracture industry opposition and peel off companies that stand to profit namely, the ones that have already switched to gas and could sell the credits to other utilities.
The idea was that countries whose emissions fall under the emissions cap -- the permitted level of CO2 equivalent emissions per year -- could then sell those carbon credits to countries who are not able to meet their own caps.
For example, MMA Renewable Ventures and its investors enjoy a 30% tax credit, have the benefit of accelerated capital depreciation schedules, and sell solar energy credits generated by the project to NV Energy, which must obtain 20% of its power from renewable sources by 2015.
If the EPA adopts the proposals that such green groups as the Natural Resources Defense Council are lobbying for, utilities that phase out their coal operations early would generate credits they could sell to other operators to keep their coal plants running longer.
UBS, an investment bank, but they can sell it for three times that amount once credits from Europe's carbon-trading scheme are included.
While the municipal bond market is so frothy and has bid up all prices, sell out your weak issues and swap into strong credits.
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The good news is that homebuyers, incentivized by low interest rates and government tax credits, are making it possible to sell otherwise unsellable properties.
Once completed, the project will sell 100 percent of the power and renewable energy credits generated to Southern California Edison under 20-year fixed price power purchase agreements.
In addition to food, many of them sell a broad range of household products, from toothpaste to cooking gas to credits for mobile phones.
Crooks have thousands of credit card numbers and are trying all the time to do something, like set up hundreds of Skype accounts with credits for say a hundred dollars, that they can then go and sell out on the streets.
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Jana Eggers, chief executive of Spreadshirt, credits the banner ads with boosting by 20% the number of people who use Spreadshirt to sell their own customized products.
Typical of the corporate average fuel economy (CAFE) rules, there are many credits offered for different types of vehicles based on their drivetrains, encouraging automakers to make and sell alternative drive and alternative fuel vehicles.
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