A lot of people have been putting two and two together and getting four thousand - somehow everything that is happening is blamed on a tiny difference that couldn't possibly be responsible.
The amount of increase in CO2 for the last 150 years is estimated at .010% by volume. Commercial greenhouse growers increase the amount of CO2 by about ten times that amount to encourage plant growth, but I haven't heard of any "pollen explosions" resulting from that!
The only way the eco-terrorists can maintain their power is to claim that they're the only ones who can see clearly what is happening and only they stand between us and total disaster. Kind of like the old shaman/medicine man thing when they made lots of wild claims and took all the credit (and power) when a couple actually happened. The eco-terrorists are also living off the rest of us while contributing nothing but confusion.