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Green roofs can save lots of money for building owners thanks to energy cost savings of up to 50%, longer life spans and financial incentives in various cities. However, a lack of awareness of green roofs' benefits may be limiting their market reach, experts say. "And I think there's been some negative information out there about the difficulty of maintaining, the cost of maintaining and the cost of installing them," said environmental adviser John-Patrick Curran. 

Levi's Stadium, the home of the National Football League's San Francisco 49ers, features an urban farm that will produce as much as 150 pounds of produce weekly. The garden encompasses 4,000 square feet of the 27,000-square-foot green roof that also has solar panels.

The Microsoft (MSFT, Tech30) founder is joined by some of the world's richest people in supporting a 20-year fund called Breakthrough Energy Ventures. Investors include Amazon (AMZN, Tech30) founder and CEO Jeff Bezos, Virgin Group founder Richard Branson, and Alibaba (BABA, Tech30) Executive Chairman Jack Ma. Gates will serve as the chairman of the fund, which is the venture arm of the Breakthrough Energy Coalition, a group founded last year to accelerate research and investment in clean energy.

Climate change and other hurdles mean it will take more water - and potentially more taxpayer money - to save the Everglades, according to new scientific findings released Thursday. The report to Congress warns that rising seas and warming temperatures are threatening to worsen damage already done by decades of drainage and pollution, caused by development and farming overtaking the Everglades. A recent report showed that climate change, pollution and other factors could increase the cost to restore the Florida Everglades. So far, restoration costs are pegged at $16 billion, but additional efforts, such as proposed reservoirs, could add to that cost.

Wegmans Food Markets and other grocers, businesses and communities are working with the Environmental Protection Agency and the Department of Agriculture to cut 50% of food waste by 2030. Municipal and state efforts to reduce waste are being accompanied by grocers' food-donation and recycling programs.

The U.S. Department of Energy recently released its ranking of the leading utility green power initiatives, and for the 10th year PacifiCorp - the parent company of Rocky Mountain Power and the Oregon-based Pacific Power- was named among the top five programs nationally.

The world's most popular cheap cooking oil is becoming less affordable. Palm oil prices are up 10% since the start of the year, and closer to 16% since the end of January, when they dropped to $765 per tonne ($843 per ton). The stuff hasn't been this expensive since September of 2012.

NEW YORK - Touted as the world's largest gathering ever on climate change, this week's U.N. Climate Summit will be as much about business as politics. Major companies, including Big Oil, will make pledges to help fight global warming by cutting their heat-trapping carbon dioxide emissions, protecting the world's forests and reducing methane leakage from fossil fuel production.

Whole Foods is the No. 1 grocer in terms of seafood sustainability this year, according to Greenpeace's 2015 Carting Away the Oceans report. The list honors stores that harvest or raise their fish offerings with minimal environmental harm. Rounding out the top five were Wegmans, Hy-Vee, Safeway and Target. 

Ringling Bros. and Barnum & Bailey Circus will be elephant-free by 2018, with the troupe's 13 performing pachyderms sent into retirement at a Florida conservation center. The move is a response to growing consumer concerns about the animals' welfare, coupled with the prospect of local bans on elephant performances. "It's a shame this took so long, but it's a creditable step toward treating animals with respect and dignity," writes Andrew Revkin

Chevrolet is buying up emissions credits linked to 11,000 acres of grasslands in North Dakota. In exchange for payments from Chevrolet, the ranchers who own the land agree not to till their properties, reducing carbon emissions. "The amount of carbon dioxide removed from our atmosphere by Chevrolet's purchase of these credits equals the amount that would be reduced by taking more than 5,000 cars off the road," said Agriculture Secretary Tom Vilsack.

McDonald's announced Tuesday that it has set two ambitious environmental goals that it wants to achieve by 2025. The fast food giant wants to have 100% of its customer packaging come from renewable, recycled, or certified sources and have recycling available in all its restaurants. Currently, 50% of its guest packaging comes from sustainable sources and only 10% of its restaurants are recycling.