Reuters: Global warming might be one explanation for Pakistan’s devastating floods, but scientists believe poor land management, outdated irrigation systems and logging are at least as much to blame. Flooding has battered Pakistan since the onset of heavy monsoon rains a month ago, affecting a wide central belt. More than 1,600 people have died and more than 6 million are homeless, according to the U.N. The total population affected is at least 17 million. Water covers a fifth of …