Based on historical increases, nearly 1 billion in low - income housing tax credits is projected to be awarded in 2010. (nreionline.com)
But the burning of oil, coal, and gas also caused most of the historical increase in atmospheric levels of heat - trapping greenhouse gases. (responsiblescientists.org)
44) The historical increase in the air's CO2 content has improved human nutrition by raising crop yields during the past 150 years (quixoteslaststand.com)