Not only is CO₂ an essential part of the Earth's atmosphere but there is very little of it. About 0.36 of 1%. Enough to supply the needs of plants but too little to have any effect on global temperatures.

A slight increase, even doubling, of CO₂ would have a huge beneficial affect on crop vigor and increase production. That will be needed if the Third World keeps attempting to overwhelm the world's food production capacity with absurd birth rates.

A slight increase in air temperature, perhaps 1 or 2 degrees would put us back to the temperature levels of 800-1000 years ago and would also bode very well for increased food production, especially in regions of Canada, Alaska and Greenland.

As far as glacier melt, it is only brought to the public's attention when a glacier gets smaller. There are just as many glaciers that are increasing in size. Net icepack is the same as it was 40 years ago, it is just in different places.