Assertion : Presently, the global atmosphere is warming up. Reason : The depletion of stratospheric ozone layer has resulted in increase in ultraviolet radiations reaching the earth.

Step-by-step solution

The warming up of global atmosphere present day is due to the increase in green house effect. Green house effect (GHE) describe the roles of water vapour, CO ₂ and other trace gases in keeping the Earth's surface warmer. These gases are relatively transparent to incoming shortwave radiation (visible spectrum), but are relatively opaque to outgoing reradiating (infrared rays) longwave radiation. The latter radiation, which would otherwise escape to space, is trapped by these gases within the lower levels of the atmo