Can the human race take action to stop global warming?
There are two ways to answer this question.
First, we can look at physical possibilities. In this case, the answer is that the human race can take action to stop or reduce global warming. Almost all scientists believe that warming is being caused by human action. Therefore, human action could reduce warming. People would have to reduce the amount of greenhouse gasses that they are putting into the atmosphere by doing things like using less energy and finding more sources of energy (like solar, wind, and nuclear) that do not emit greenhouse gasses.
Second, we can look at political/social possibilities. Here, the answer is much less clear. Many people around the world do not believe global warming is a real problem. Others believe it is a problem but that it is less important than trying to keep economies growing. For reasons such as these, many countries do not seem to have the political will to take the actions that are necessary to reduce global warming.
It is, then, physically possible for humans to reduce global warming, but it is not at all clear that humans care enough to do what is needed.