Building on the hugely successful annual Economist 'The World in ...' publications, this essential guide to the 21st century captures the sweeping, fundamental trends that are changing the world faster than at any time in human history.

In 2050 there will be 9.3 billion people alive - compared with 7 billion today - and the number will still be rising. The population aged over 65 will have more than doubled, to more than 16 percent; China's GDP will be 80 percent more than America's; and the number of cars on India's roads will have increased by 3,880 percent. And, in 2050 it should be clear whether we are alone in the universe.What other megachanges can we expect - and what will their impact be?

This comprehensive and compelling book will cover the most significant trends that are shaping the coming decades, with each of its 20 chapters elegantly and authoritatively outlined by Economist contributors, and rich in supporting facts and figures. It will chart the rise and fall of fertility rates across continents; how energy resources will change in light of new technology, and how different nations will deal with major developments in science and warfare.

Megachange is essential listening for anyone who wants to know what the next four decades hold in store.

Daniel Franklin is Executive Editor of The Economist and Editor of The Economist's annual publication,'The World in...'. John Andrews has written for TheEconomist for more than 30 years having been based in the Middle East, Europe, Asia, and America.