Fortunately, they do. Higher atmospheric CO2 levels mean that plants can obtain the CO2 they need more easily, with the stomata in their leaves not having to open as much. Consequently, they loose less water through the stomata, and are more drought resistant.
Of course, this only helps to a certain extent. A bad enough drought will still be very bad. And a very bad drought is bound to happen sooner or later, just from natural variability. So a robust food supply system, incorporating both a degree of local self-sufficiency in inputs, and global trade (for when crops fail in one location) is essential.
Fortunately, they do. Higher atmospheric CO2 levels mean that plants can obtain the CO2 they need more easily, with the stomata in their leaves not having to open as much. Consequently, they loose less water through the stomata, and are more drought resistant.
Of course, this only helps to a certain extent. A bad enough drought will still be very bad. And a very bad drought is bound to happen sooner or later, just from natural variability. So a robust food supply system, incorporating both a degree of local self-sufficiency in inputs, and global trade (for when crops fail in one location) is essential.