June 26, 2005
The Science of Global Warming -- ocean warming caused by humans
Link: Science Express Highlights. (AAAS members only)
A forthcoming Science article indicates that the upper parts of all of the oceans of the world have become warmer during the past 50 years, such warming could only have been caused by the absorption of huge amounts of heat, and the warming patterns can only be explained by human activities. The article by Barnett et al.
examines the patterns of warming on an ocean-by-ocean basis, as a function of amount, location, and time and discuss the physics responsible for the observed trends. The patterns of warming can be reproduced accurately by two different climate models only if anthropogenic forcing is included. In addition to showing that these climate models can faithfully reproduce how the oceans have responded to global warming, and by implication that they are in fact credible tools for predicting climate, these results also show that this ocean warming must be the result of radiative forcing of atmospheric greenhouse gas increases caused by human activity.
GAO Report on Mercury Control at Power Plants
GAO's report on mercury controls at powerplants released last week indicates that emerging technologies such as sorbent injection can achieve up to 95% removal and that 70% removal for a medium-sized power plant would cost roughly $ 1 million in capital costs and $ 3.4 million annually in operating and maintenance costs. GAO acknowledges that efficiency and cost are affected by a variety of factors. GAO also suggests that previous EPA and DOE cost estimates overstated the cost of mercury controls. GAO report on mercury removal efficiency and costs
This report follows the controversy about EPA's cost-benefit analysis of the March 15 mercury rule. EPA mercury rule and supporting documents GAO had previously criticized EPA's cost-benefit analysis.. GAO report on EPA Cost-Benefit Analysis of Mercury Rule