History of Global Environment

About ten thousand years ago ,when mankindchanged from a hunter-gatherers,living in widerness areas such as forests and grasslands,into agriculturistsand pastoraists,we began ti change the Environment tos uit our own requirements .As our ability to grow food and use domestic animals developed,these 'natural'ecosystems were converted in to agricltural land .Most traditional agriculturists depended extensively on natural sources -rain strmes. and

rivers-for water.Later they began to use wells to tap underground water sources and tio impound water and created irrigred land by building dams .Recently,we have begun to use fertilizers and pesticies.