Some sports fans may now know as much about global warming as they know about women's swimwear: Sports Illustrated this week tells readers how a warming world is going to change the state of play.

The American male's favorite read for its sports coverage and annual swimsuit issue is just one of many U.S. magazines coming out with global warming on their covers as awareness and concern over a climate crisis grow in the United States.

ELLE, Outside Magazine and The Atlantic Monthly will also feature global warming and the environment in coming weeks.

In what can only be considered a tidal wave of public opinion, a new Yale research survey reveals a significant shift in public attitudes toward the environment and global warming. Fully 83 percent of Americans now say global warming is a “serious” problem, up from 70 percent in 2004. More Americans than ever say they have serious concerns about environmental threats, such as toxic soil and water (92 percent, up from 85 percent in 2004), deforestation (89 percent, up from 78 percent), air pollution (93 percent, up from 87 percent) and the extinction of wildlife (83 percent, up from 72 percent in 2005).

Global warming activist Laurie David and Grammy Award winning singer-song writer Sheryl Crow will kick off the Stop Global Warming College Tour in Dallas, TX to urge college students to become part of the movement to stop global warming and demand solutions from themselves, their schools and their country.

During the two-week tour, college students, university leaders, faculty and staff will be encouraged to join the Stop Global Warming Virtual March and have their voice counted as the bus rolls through their campus. Over 675,000 individual marchers from all 50 states have joined the virtual march to acknowledge that the U.S. is feeling the impact of global warming right now and to demand solutions to the problem.

Montreal's transit corporation is switching to biodiesel fuel and buying hybrid buses in an attempt to green its fleet and cut carbon emissions.

All Société de transport de Montréal (STM) buses will run on biodiesel fuel by 2008, and the transition should be fairly inexpensive, said president Claude Trudel.

Bus engines can run on biodiesel fuel without requiring any modifications, and the cost of a fill-up should be the same. The STM even stands to save money on maintenance, because biodiesel is "a cleanser, so it will keep your engines and your cylinders cleaner," said spokesman Luc Tremblay.

The Bush administration ran a systematic campaign to play down the dangers of climate change, demanding hundreds of politically motivated changes to scientific reports and muzzling a pre-eminent expert on global warming, Congress was told yesterday.

The testimony to the house committee on oversight and government reform painted the administration as determined to maintain its line on climate change even when it clashed with the findings of scientific experts. James Hansen, who heads the Goddard Institute for Space Science in New York, said in prepared testimony: "The effect of the filtering of climate change science during the current administration has been to make the reality of climate change less certain than the facts indicate, and to reduce concern about the relation of climate change to human-made greenhouse gas emissions."

Arctic sea ice that has been dwindling for several decades may have reached a tipping point that could trigger a cascade of climate change reaching into Earth's temperate regions, says a new University of Colorado at Boulder study.

Mark Serreze, a senior research scientist at CU-Boulder's National Snow and Ice Data Center who led the study synthesizing results from recent research, said the Arctic sea-ice extent trend has been negative in every month since 1979, when concerted satellite record keeping efforts began. The team attributed the loss of ice, about 38,000 square miles annually as measured each September, to rising concentrations of greenhouse gases and strong natural variability in Arctic sea ice.

Al Gore, a Democratic favorite for the presidency despite pronouncements that he's not running, spoke out on his signature issue Wednesday, warning of a "true planetary emergency" if Congress fails to act on global warming.

In a return he described as emotional, Gore testified before House panels that it is not too late to deal with climate change "and we have everything we need to get started." By turns folksy and prescriptive, he urged the Democratic-controlled Congress to adopt an immediate freeze on greenhouse gases blamed for global warming.

Colorado's distinctive lodgepole pine trees are under attack from a beetle infestation described by scientists as a "perfect storm" which could destroy 90% of the western American state's pine forests.

The bark beetle outbreak was responsible for the death of 4.8m lodgepole pines in Colorado last year, up from 1m in 2005. The infestation has spread across 1,000 square miles of forest - nearly half the total in the state. Forty three per cent of the state's lodgepole pines have died as a result of the infestation. But it is not limited to Colorado: the beetles have munched their way through the western US and Canada, affecting 36,000 square miles of forest.