Billionaire businessman Michael Bloomberg is co-authoring a book on climate change with environmentalist Carl Pope, publisher St. Martin’s Press said Wednesday.

The New York City-based book publisher told the Associated Press the book will hit shelves April 18. “Overheated: How Cooler Heads Can Cool the World” will offer “viable, concrete solutions” to deal with global warming with its authors hoping to remove the “partisan rhetoric.”

Bloomberg, a former New York City mayor, admitted that he and Pope didn’t always agree on issues but hoped to inspire conservatives and liberals to work together to tackle global warming.

Pope who served as the executive editor of the Sierra Club from 1992 to 2010 works with Bloomberg as an adviser on climate change. The Sierra Club is an American environmental organization founded in 1892 by conservationist John Muir. After stepping down as executive editor, Pope served as the organization’s chairman till 2011.

Bloomberg, who served three terms as Mayor, is a United Nations special envoy on climate change and cities. He had introduced programs that reduced the city’s carbon footprint by nearly 20 percent. He is also CEO of the Bloomberg L.P. news media company.

The billionaire, who mulled running for presidency this election season, decided against it in March saying his bid would hand businessman Donald Trump or Texas Sen. Ted Cruz the White House.