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2009年秋季以来，西南5省市遭遇百年不遇大旱，给生产和生活造成严重威胁。大旱之后必有大涝。2010年5月以来，南方多省市又相继遭遇大范围强降雨天气，形成大面积洪涝灾害。从大旱到大涝，全国上下动用了大量人力、物力、财力，同心协力抗旱排涝。在此过程中，人们也在思考造成大旱大涝的原因。旱涝的直接原因在于降水的多与少，而大的气候背景是全球气候变暖，厄尔尼诺和拉尼娜现象加剧破坏了大气结构，造成各种极端的气候事件。旱涝的背后更有人祸因素：生态环境被严重破坏，而水利设施建设又不足，各种应急不力等等。大旱大涝再次警示我们，要加快转变经济发展方式，要加强水利设施建设，要有防患未然的忧患意识，要重视科学抗旱抗涝体系建设……这些经验教训，对今后工作具有重要意义。上述材料是如何体现认识论道理的？
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