Isolated for 42 days in chambers of ambient and elevated CO2 concentrations, they periodically documented the growth of cowpea plants (Vigna unguiculata) via time-lapse photography with quite impressive results indeed...............Carbon dioxide is good for the environment. The simple fact must be restated to counter environmentalists' baseless allegations that the accumulation of man-made carbon dioxide, produced by cars, power plants and other human activities, is causing dangerous global warming. Indeed, far from being a poisonous gas that will wreak havoc on the planet's ecosystem, carbon dioxide is arguably the Earth's best friend in that trees, wheat, peanuts, flowers, cotton and numerous other plants significantly benefit from increased levels of atmospheric carbon dioxide. Increased atmospheric carbon dioxide doesn't just make a plant bigger. Carbon dioxide also makes plants more resistant to extreme weather conditions. Bigger trees, increased resistance to bad weather, improved agricultural productivity and a boon to rainforests are just some of the many benefits that carbon dioxide bestows on the environment. With little evidence that carbon dioxide triggers dangerous global warming but lots of evidence showing how carbon dioxide helps the environment, environmentalists should be extolling the virtues of this benign greenhouse gas.