evidence: The most recent solar cycle was relatively quiet, leading to a lot of fearmongering over an impending Grand Solar Minimum, a longer period of time spanning several cycles where even the maximums are subdued. Reports suggested global temperatures would plummet, producing a mini ice age. NASA gave this idea a sound drubbing earlier this year. "The warming caused by the greenhouse gas emissions from the human burning of fossil fuels is six times greater than the possible decades-long cooling from a prolonged Grand Solar Minimum," wrote the NASA Global Climate Change team in February. "Even if a Grand Solar Minimum were to last a century, global temperatures would continue to warm. Because more factors than just variations in the Sun's output change global temperatures on Earth, the most dominant of those today being the warming coming from human-induced greenhouse gas emissions."