Academy of Sciences of Heroesland

I'd like to start a new discussion, specifically about global warming. First, some information: wikipedia
I want to draw particular attention to this:

Climate systems change as a result of both natural internal processes and in response to external influences, both anthropogenic and non-anthropogenic. Geological and paleontological data show the existence of long-term climate cycles, which in the Quaternary period took the form of periodic glaciations, and the present time falls within an interglacial period (see figure).

In general, I adhere to the theory of periodicity. Humans are unlikely to be able to significantly change the climate on Earth. The only way would be to cut down forests in quantities comparable to their total area. Otherwise, a slight increase in the concentration of carbon dioxide in the atmosphere will immediately lead to an increase in its consumption by plants, as the latter experience a significant deficiency of it in our conditions. Thus, its concentration will level out.
The periodicity theory suggests that, due to certain natural factors, the temperature on the planet experiences fluctuations (as claimed by the geographer who taught us in school and managed to earn my deep respect; the period of fluctuations is 300 years). I am inclined to believe this. Although this does not mean that we can slightly increase deforestation and emissions from factories into the atmosphere. But not because our climate might change significantly as a result, but because we can cause enormous harm to living creatures nearby, including humans (and especially humans).
This is my humble opinion. What do you think, colleagues?

Added 5 minutes later
Oh, I forgot. The melting of ice. This is really funny. It is believed that global warming leads to the melting of glaciers, which can raise the level of the world's oceans by several meters. Ha-ha, if the ice melts, it will significantly decrease in volume, because its density is less by a tenth! And where, I wonder, will the extra few meters of water come from?