Question

If carbon-dioxide present in the atmosphere is only 0.03% how can it causes Global warming?

Answer 1

Due to certain human activities like deforestation, burning of fossil fuels, industrial emission of gases there has been an increase in concentration of atmospheric CO₂ from 0.03 % to 0.038 and this little change in its concentration is enough to cause increase temperature or warm up the climate . Because if not than our our earth would have been very much colder.

Thus little change in conc of CO₂ is extremely powerful to raise the temperature of earth's climate considerably.

And yet the researches are going on in many countries on this effect of global warming due to CO_2.