Yes, the cooling has begun.
A period of warming typically precedes a rapid cooling. That is what we have experienced over the past several decades. It is very much about changes in the Sun, but it is also affected by the new region of space that our solar system has entered. As a result, levels of radiation are gradually rising, but not to worry, our DNA will adjust and actually become more engaged/efficient.
The Earth/oceans are conducting a systemic cleanse/rejuvenation. Yes, parts of the Earth where we used to grow food will no longer be fertile, while at the same time, areas where very little could grow will become very fertile.
Humanity is becoming empowered like never before and the planet is adjusting/adapting in a way that will supports that.
Fear not. Instead, consider evolving/expanding your consciousness in a way that enables you to thrive in the unfolding new environment/reality that is emerging on the planet. Much of humanity will not do so, and for them, there will be extensive struggle/difficulty. Those that do will be called upon to help/lead in significant ways that are not easy to imagine/comprehend at this point.
Do what you need to do to ensure your own well-being - as a priority; that is what will then enable you to be of assistance to others.