[fluffy0000]

Only recently since early part of 20th century has the human population taken advantage of scientific advancements that transformed agriculture from simple farming into what it does today. Population of the earth in 2008' roughly 6,679,493,900 (United States Census International Programs Center)without the developement of artificial cheap nitrogen fertilizers developed in 1913' see Fritz Haber Nobel laureate Chemistry without this discovery the maximum growth of the worlds population would be roughly little more than half this number.
Since the last climatic changes identified as glacial periods recently identified as peaking as recently as 12,500 yrs ago and technically speaking - still occuring as we speak today in 08'.
Please note these glacial periods are ice sheets that are called names like Fraser, Pinedale, Wisconsin (in North America), Devensian (in the British Isles), Midlandian (in Ireland), Würm (in the Alps), Weichsel (or Vistula, in northern Central Europe), Valdai in Eastern Europe and Zyryanka in Siberia, Llanquihue in Chile and Otira in New Zealand.
Note the size and locations of these ice sheets and appreciate the size and fact that a great majority are or were located astride the 'breadbasket' of the planet. Even minor disruptions in weather with todays technology let alone market driven forces ( alternative fuels based on corn, soy, methene
biodiesel - have disrupted food prices and raised havoc especially in 3rd world nations such as Haiti, Sudan, Afghanistan, Mexico , Asia ). Note price increase
of the simple 'baguette' in France has been raised 3 times in less than as many weeks. Agriculture does not do well in markets driven by speculation
because poor people when hungry can topple governments- and topple economic markets far in advance of any 'Global Warming'.