While it is true that plants need CO2 for photosynthesis, the idea that excess CO2 in the atmosphere is good for plants oversimplifies the complex relationship between plants, CO2 levels, and global warming.
Firstly, the optimal CO2 concentration for photosynthesis in most plants is around 400 ppm (parts per million). The current CO2 concentration in the atmosphere is over 410 ppm, which is higher than it has been in at least the past 800,000 years. This means that while some plants may benefit from increased CO2, many others will experience negative effects, such as decreased nutrient content, reduced growth, and decreased photosynthetic efficiency.
Secondly, while it is true that some chemical reactions occur faster at higher temperatures, the overall effects of rising temperatures on plants are complex and can be negative. For example, high temperatures can cause heat stress in plants, leading to reduced photosynthesis and growth, and increased susceptibility to pests and diseases.
Furthermore, rising temperatures and the associated changes in weather patterns can also lead to more extreme weather events, such as droughts and floods, which can be detrimental to plant growth and survival.
In summary, while it is true that plants need CO2 for photosynthesis and some chemical reactions happen faster at higher temperatures, the idea that excess CO2 in the atmosphere and rising temperatures are good for plants oversimplifies the complex relationship between plants, CO2 levels, and global warming. It is important to consider the broader impacts of climate change on plants and ecosystems when evaluating the effects of rising CO2 levels and temperatures