In this case, we need to separate events, on one hand, we have COVID-19 and on the other, we have climate change. Also, their repercussions and implications differ one from another. In the case of Climate change, we have that, there is an increase in global temperature making many sites warmer and changing ecosystems for wildlife, among these consequences we have extinctions, local and global, also there is a change in species distribution sometime are smaller other times there is displacement. Another consequence is the uncontrolled proliferation of other organisms, all these together mark a disequilibrium in populations, communities, ecosystems, and in the general biosphere. However life is dynamic so is changing all the time, that is to say, evolving, so we can see some early changes like columnar cacti that are changing from pollinators instead of bats, moths are taking their places as the distribution of species is changing.
In the case of COVID-19 is a very recent phenomenon that actually impacts a reduced group, humans, many of the problems generated are of social character more than biological, nonetheless when there is change as a society there is an indirect effect on the environment, for example, levels of air pollutants have diminished due to the prolonged quarantines. Other consequences can be mentioned at a physical level, it is known that viruses mutate, however, our own immune system has the same capacity, so the impact of coronavirus will be less as humans start to coevolve with the virus.
Now from a scientific approach, how these changes ans consequences are noticed? well, there is a number of different approaches inside the scientific method, nonetheless, there are certain key points that scientific studies must follow. The first and most important is the observation of the phenomenon, a hypothesis formulation, and the collection of information to prove or disprove the hypothesis, finally deductions and conclusions are obtained based on the observations and data found.