I agree with your viewpoint that we should be concerned about solution rather than cause..because after all its about saving ourselves or saving living creatures on earth but if we know that whether it's man-made or natural than we can prevent it better way.

We also know that climate changes naturally due to universal elements but it's long term effect n what we are doing is accelerating this process by polluting environment so we should rather stop this things,it would be better.

In fact, the mechanism fo anthropogenic global warming can't work, because CO2 is too weak a greenhouse gas,and the amount of CO2 that humans have put into the atmosphere is less than the normal annual change in CO2. If there were anything to investigate, ten the people who think that AGW is real should have dreamed up better reasons.

At present the Earth is within its normal range of temperature. A thousand years ago there was an agricultural colony on Greenland that grew the same mix of crops as were grwon in Scandinavia. At this time it is too cold form them to grown most crops; the oats won't ripen in the fields. Let's wait for the oats to ripen before we start to worry.

I think Green House Effect happens due to radiation caused by green house gases like water vapor,CO2,CH4 etc..and we are also aware of duel atmosphere n abnormal changes in seasons like prolonged raining season in some parts of region n drought in some parts..n this doesnt seem natural...so global warming is a point to be concerned about..let's see how quickly our environmentalists sort it out..

The greenhouse effect is caused by infrared radiation being absorbed by the vibrations of molecules that are dipoles. H2O has a strong dipole moment and it is a major greenhouse gas. CO2 is a monopole, so it has a negligible greenhouse effect.
Here's an article on it:
http://www.atmos.washington.edu/~davidc/ATMS211/Lecture14-handout-PDF.pdf