Figure 1.

Elevated atmospheric CO₂ affects plant-insect interactions through its direct effects on plant metabolism and elevated temperature through its direct effect on plant and insect metabolism. Some insects respond directly to elevated CO₂ during oviposition, when foraging for live or dead plant material belowground, or when foraging for nectar, for example (Goyret et al., 2008). At current and projected future levels of atmospheric CO₂, the primary effect of elevated CO₂ on the suitability of plant tissues as food is mediated largely through changes in plant chemistry and morphology.