On Top of the World Greenwar brings you into the gritty action of coporate takeovers in the 21st century. The PCs are hired by the Browning Investment Group to engineer the hostile takeover of Liverpool Shipping. The Browning Group doesn't care how the PCs achieve their objective: leveraged buyout, sabotage, discreet assassination all are viable means in their eyes. A subtle hand is required, however: If the PCs inflict substantial material damage Liverpool Shipping, or destroy its reputation, they may succeed in driving down its stock prices...but they'll have ruined the value of the company their employers would like to own! As a campaign book, Greenwar includes information for a flexible, extended scenario (the takeover), new corporations, detailed maps, numerous NPCs, and an appendix with information on handling stocks and the market in the Cyberpunk 2020 game.