建议讲环保方面的题材,下面是一篇有关环保和全球性暖化的英文文章,500字,可应付4至5分钟的演说:==========================Recycling and Global Warming==========================One of the biggest issues in the world today is global warming. Global warming affects all parts of the world, not just our county. If we don’t take steps to control it now, future generations