Wyoming Business Report: An Affordable Energy Rally attended by both Wyoming U.S. senators and Gov. Matt Mead drew about 300 people in Gillette Thursday, though organizers expected as many as 1,000. The meeting was a rallying cry against proposed U.S. Environmental Protection Agency regulations to cut carbon dioxide emissions by 30 percent by 2030. While environmentalists say such action is necessary to abort or slow global warming, many Wyoming and national leaders are saying the measure will slow economic growth while…