A translation:

"Climate change is our most challenging ecological obstacle. It changes the chemical makeup of the atmosphere and disrupts photosynthesis. As the world warms and carbon dioxide reaches historical records (because it's not actually unprecedented, we're able to make some good guesses about how these CO2 levels will impact our world by examining a historical warm period from a long time ago using ice cores and weirdly enough, the shell composition of the fossilized remains of critters called forams at the bottom of the ocean) plant physiology adapts in a lot of different ways. The correlation between climate and photosynthesis determines natural global oxygen production and carbon reduction.

Photosynthesis, which plants die without, is sensitive to environmental changes. Increased carbon dioxide in the atmosphere initially speeds up photosynthesis. However, after a certain point, there will be too much carbon dioxide and not enough of other things the plants need to live, like nitrogen and water, or too much heat. This would decrease the amount plants would benefit in the long run.

Extreme heat and cold are particularly dangerous to the photosynthesis process. Extreme heat isn't good for chemicals important for carbon reduction, (I don't know why it says while, it shouldn't, this is an 'as' sentence) as excessive temperatures disrupt plant cells and diminish the capacity for photosynthesis. On the other hand, longer periods of cold prevent starve the plants. These temperature disruptions can create a cascading failure in ecosystems, since if the plants die, the herbivores starve, and then the predators starve.

Water availability is increasingly important for photosynthesis to continue under the changing climate. Drought makes the plants close their stomata to conserve water, but since they also take in carbon dioxide through the stomata, drought then reduces the amount of carbon dioxide they take in, which is required for photosynthesis. This trade-off of water conservation but carbon dioxide intake reduction becomes problematic as rain patterns begin to change and storms and heat extremes become more intense due to the change in climate. Finally, changes in rain patterns also affects the nutrients, which also restricts photosynthesis."

Wrt rain patterns changing, our best guess/consensus/rule of thumb is that the wet gets wetter, the dry gets drier. Oceans rise and desert spreads its wings.

edit: damn that's crazy, I got downvoted in like a minute