What is the author's attitude to the "gloomy forecast"

A．Environment pollution has manifested alarming threat for human survival.
B．The chance for human beings to rescue the planet is very slim.
C．Compared with aerosols, carbon dioxide is far less threatening to human beings.
D．The gloomy forecast cannot hold water if the aerosol layer is eliminated.

A．It may reflect heat coming from the sun.
B．It facilitates the balance of heat on the Earth.
C．It would start another ice age.
D．It accelerates the loss of heat on the surface of the planet.