The world faces myriad challenges – yet we are constrained by scarce resources. In the 21st Century, how do we deal with natural disasters, tackle global warming, achieve better nutrition, educate children… and address countless other urgent global issues? If you want to change the world, this inspiring and enlightening book is for you. Bjørn Lomborg presents the costs and benefits of the smartest solutions to twelve global problems. By prioritizing the top solutions, this helps us better spend $75 billion to do the most good. Featuring the cutting edge research of more than sixty eminent economists, including four Nobel Laureates, produced for the Copenhagen Consensus, this book will inform, enlighten and motivate actions to make our world a better place.