ADVERTISEMENT allows customers to donate to green-minded projects—including planting trees, reducing greenhouse gas emissions, and financing “renewable-energy installations”—by purchasing carbon offset credits. For large orders, it will customize contributions, so funds go where you want., the home page of the Climate Protection Partnership, directs funds to “projects that reduce gases” and underwrite “renewable energy” worldwide. and its emissions calculator help travelers tabulate the quantity of greenhouse gases created by their air travel. They can then contribute to projects that help limit “fossil-fuel usage,” ranging from a hydraulic ram in China to a hydro power plant in Honduras.

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