claim: When all forcings are combined, they show good correlation to global temperature throughout the 20th century including the mid-century cooling period.
evidence: As of 2008, the price of grain has increased due to more farming used in biofuels, world oil prices at over $100 a barrel, global population growth, climate change, loss of agricultural land to residential and industrial development, and growing consumer demand in China and India Food riots have recently taken place in many countries across the world.