Al-Battani Shield

Or, are we going to experience another Ice Age with equally unpleasant catastrophe? If humans are responsible, how exactly have we brought this upon ourselves? Most importantly, can we do anything to remedy past and current mistakes and stave off the calamity? What steps are politically and economically possible? And are there any other reasonable, alternative ways we can hold the climatic status quo which have not been thought of yet but need to be?