In fact, there is general agreement that global temperatures warmed from 1910 to 1940 and cooled from 1940 to 1975. Temperature changes since 1975 are hotly debated, with the IPCC claiming temperatures have warmed based on surface temperatures. The IPCC explicitly admits a lack of knowledge and a low understanding for nine of the 12 factors thought to affect global climate. There is only a high level of understanding for greenhouse gases, such as carbon dioxide, methane and nitrous oxide. Just like wildfires are nature's way of renewing the forests, the atmosphere has means of renewing itself that we are only beginning to understand.
Much more research needs to be done before the scare of global warming can have any credibility.