Next year will be the warmest winter and the year after that and so on
Definitely. If you look at the temperature graph over the last few decades, it's been a steady and increasingly accelerating upward rise. Coincidentally, the amount of carbon dioxide being released has also been increasing during the same time frame. Once the Earth's temperature rises, it creates a snowball effect. The polar ice caps melt, and less sunglight is being reflected back, making the Earth even hotter. Carbon dioxide that was trapped in the oceans begins to be released, as warm water cannot hold onto it as efficiently. That's why there is a "tipping point" where beyond a certain temperature increase, it becomes exponentially difficult to lower the Earth's temperature back.
The warming of the planet will lead to more erratic and extreme weather, as well as the disturbance of animals habitats and interrupt their normal behavior. For example, the melting ice caps have caused some polar bears to die swimming for hours, trying to find solid ice to rest on. There will be flooding, a significant decline in food production, and many other problems which will threaten world stability. The world is already on the verge of World War 3, but imagine how much more dangerous things are when countries are starving, and economies around the world start to collapse.
That is why it's critical to take action before it's too late. However, oil companies have purposely tried to obfuscate the situation. They first claimed that global warming was a hoax, and that the Earth's temperature was not rising as a result of carbon dioxide emissions. When the data and evidence was so overwhelming, they then tried to say that global warming was real, and man made, but that there would be no effect on the planet. This is reminiscent of how cigarette companies tried to hide evidence and deceive the public about the link between smoking and cancer, in order to protect their profits.