If the concentration of CO2 increases, more heat will be trapped which will be radiated back to earth increasing the atmospheric temperature around the earth.
The warming of the earth would make the polar ice caps melt further.
The water produced by the melting of ice will increase the size of the ocean which may engulf and submerge large areas of land and cities situated near the coastline.
It causes floods which may lead to the destruction of houses and buildings.
The increased temperatures would alter the climate and rainfall, affecting flora and fauna.
It would adversely affect the climate in the biosphere.