The theory and physics of greenhouse gases and climate were described during the late 1700s and the mid-1800s [3]. GCC is supported by compelling scientific evidence from multiple independent sources (eg, weather records, glacier dynamics, geochemistry, satellite imaging, and tree-ring investigations). Although controversy has dogged GCC for decades—and has flared recently—there is strong scientific evidence for a direct relationship between current climate changes and increasing anthropogenic greenhouse gases, primarily carbon dioxide (CO2) and methane (CH4) [4].
tainties about the degree and rapidity of local changes, the health consequences of GCC cannot be predicted exactly.