Some researchers believe that the effect of clouds on Earth's warming and cooling will suffice to curb climate change, but the latest research points to the opposite. NASA researchers have observed low-altitude clouds for three years as they are believed to cool the weather. Some theories argue that in a warmer atmosphere more water will evaporate and clouds will be denser, so solar umbrellas will be more efficient. But NASA researchers have seen how by increasing the temperature clouds become thin, regardless of the time of day or weather.