The summer growth

I have noticed that the amount of "greenery" this summer is substantially greater than in previous years. Those to whom I have mentioned this seem to think that if there is any extra, which they doubt, it must be because of some reaction to the large amount of snow and rain we had in the winter and spring. (Mostly, I think that they are placating me.) I suggest that it is because of the slightly increased amounts of CO2 that now exist in the atmosphere, which "feed" the plants' growth.

Today, I heard on NPR a discussion of the apparent increase in the growth of poison ivy and other such vines. The speaker noted that research suggests that these types of plants are most affected by increased levels of atmospheric CO2. Maybe I am correct in my observations after all. Here is the link:

http://www.npr.org/templates/story/story.php?storyId=128650169