Toddy its not just farmers buggering up the land, we have excess water extraction from some aquifers especially in Oz and the US to a point the over extraction is causing salty water to leach into the aquifers from the coastal areas, we see again in Oz over watering of land causing salt sediments to rise from deep underground which kills the crops. Other areas we see idiocy like that in the Mid West US and near lake Aral in the far east where some states are basically diverting rivers or pumping them dry to sustain water greedy crops thus leaving the rivers ran dry in neighbouring states. Spreading GM crops are a concern for some ecologists, then chemical fertiliser run off pouring into the seas creating toxic algal blooms and deoxygenating the seas, toxic multi million gallon reservoirs of toxic waste being allowed to escape into water ways.
Look at this horror
http://www.express.co.uk/news/nature/623...evastation.
http://www.theguardian.com/world/2013/ma...ter-supply
http://education.nationalgeographic.org/...age-patch/
Lets not forget that if for example the UK loses its power supplies ( to run pumps) much of the Somerset levels will flood as will huge chunks of the fens, Most of the wind powered drainage pumps are long gone now. And the highly poisonous water being pumped from old mine workings will start to leach into rivers or break out and run across farm lands.
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