Solar and orbital variations
Changes in solar energy can affect global temperature. Thousands of years ago, global temperature changes were driven by solar and orbital variations. The Royal Society, the National Academy of Science in the UK and the Commonwealth confirms that solar activity contributed to changes in global temperature in the early 20th century.
However, satellite measurements show that there has been little change in solar activity during the last 30 years to warrant recent global warming. Rather, the evidence points to man-made greenhouse gas emissions as the primary driver of recent increases in temperature. However, many in the scientific community agree that it is important to acknowledge the roles that the sun and orbital variations play in the global climate.