Overwhelmingly, the scientific community agrees that human activities significantly contribute to global warming. Studies have consistently shown this consensus. C. Southgate, in a recent letter to the Advertiser uses the example of Professor Hal Lewis disputing the above. However, in 1990 Professor Lewis wrote: “all models agree that the net effect of increasing greenhouse gases will be a general and global warming of the earth; they only disagree about how much. None suggest that it will be a minor effect, to be ignored while we go about our business.” It was only at 87 he resigned from the …