Which gas has recently increased in the mesosphere creating a rise in water vapor which has led to the formation of high altitude clouds that are visible at night

Question

Methane
Hydrogen
ozone
Carbon dioxide

Answer 1

The gas that has recently increased in the mesosphere, leading to a rise in water vapor and the formation of high-altitude clouds that are visible at night, is methane. Increased methane levels can contribute to changes in atmospheric conditions, including the enhancement of water vapor at higher altitudes, which can result in the formation of noctilucent clouds.