National Geographic : 2009 Mar
CO REDUCTIONS (IN BILLIONS OF TONS PER YEAR) COST COAL POWER PLANTS CARBON CAPTURE-AND- STORAGE REBUILDS CAR HYBRIDIZATION 1.3 1.5 2.0 2.5 3.0 $50 $100 DISTRIBUTED PHOTOVOLTAIC POWER GENERATION $10 PER TON OF CO REDUCED A worker in Washington, D.C., installs a triple-glazed window in a structure designed to meet strict "green building" standards. Advanced lighting, heating and cooling, and water systems, and a green roof contribute to a small carbon footprint, and can reduce energy costs by up to 75 percent. But many firms hesitate to invest in efficiency if up-front costs seem too high or payback times too long. CUTS THAT COST MONEY The power industry could achieve big carbon reductions by developing renewable energy and adopting measures such as carbon capture-and-storage for coal plants (below), though initial investments would be high.