So, for Wall Street investors and oil producers, low gas prices are not good news, but they'll get over it. For environmentalists, however, there is nothing but gloom. Sure, they'd be ecstatic if Keystone gets cancelled, but their glee will be momentary. The low gas prices that could scuttle the pipeline will also steer consumers away from electric and hybrid cars, smaller vehicles and mass transit. Lower-cost fossil fuels will mess with the economic viability of alternative energy businesses. Ultimately, cheap gas means more CO2 in the atmosphere, more melting glaciers, more sea levels rising and more climate extremes making life on Earth much less pleasant.