World hotter, sperm count falling, windpower up : The world is getting hotter and mother nature madder, sperm counts are sinking in Europe and United States and Europe, and the use of wind power is soaring, a millennium-ending snapshot of global trends finds. Worldwatch Institute's annual eclectic compilation of facts and figures, Vital Signs 1999, offers a little something for everyone making predictions about where the planet and its inhabitants are headed in the next century.