Yes, indeed.

By the way, a milk drop may be only about 0.04 % of the volume of a cup full of tea, but nevertheless is able to blur the whole liquid in the cup. Somewhat similar like that, greenhouse gases (and their changing concentration) have a significant impact on the temperature on earth in spite of their low percentage.

Recently I posted (in German) about the topic, and at least the sources might be interesting for you, too ...