re: What are your reasons for believing climate change is "a hoax"

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Post any evidence that CO2 is bad for plants. Its retarded

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While I get where you're going with this it's not entirely true.

Role of cysteine proteinase inhibitors in preference of japanese beetles (popillia japonica) for soybean (glycine max) leaves of different ages and grown under elevated CO2

Constraints to nitrogen acquisition of terrestrial plants under elevated CO2

Global CO2 rise leads to reduced maximum stomatal conductance in Florida vegetation

And this wasn't even an exhaustive literature search. It was me messing around for about 5 mins. It's also why I'm more concerned with rising CO2 levels than I am "global climate change". But I digress.

But what should be most disconcerting to all of us is how plants fix carbon from the atmosphere during photosynthesis. There are 3 basic types of photosynthesis that plants utilize to sequester CO2 from the atmosphere, C3, C4 and Crassulacean acid metabolism or CAM photosynthesis. Without getting too technical, most plants are C3 plants and have no special mechanisms for separating carbon uptake and fixation. In C4 plants, there is a spatial separation between carbon sequestration and fixation (between mesophyll and bundle-sheath cells). This essentially makes them more drought tolerant. In CAM plants there is a temporal separation between carbon sequestration and fixation. This occurs where the plant fixes CO2 into oxaloacetate by PEP carboxylase and then converts that to malate or another type of organic acid. During they day, the organic acids are transported out of the vacuole and broken down to release CO2. This means the plants can keep their stomata closed and conserve water.

The catch in all of this is the plants most likely to thrive under high CO2 are C3 plants. The competitive advantage that that C4 plants have over C3 plants evaporates in a high CO2 environment. So what you might ask? Well, most of our crop plants, like corn, are C4 plants while many "weedy" plants are C3 plants. This has the potential to reduce crop yields and could lead to increase herbicide use.

But I'm sure Monsanto will have an answer for us so not to worry.