Depends on how you define global warming.
If you mean humans heating up earth, then yeah cars, trucks, factories, etc.
But that's not whats happening now. Look at a graph of solar activity over the past million years or so, then look at a graph of earths temperatures over the past million years or so, then try to tell me they are not directly related.
Also try to ignore such evidence as the entire solar system is heating up, including Mars, Jupiter, Venus, Earth, etc. and still tell me it's humans that are causing the warming trend.
Then look at a graphs of CO2 levels next to a graph of temperatures, notice how CO2 levels always increase AFTER temps go up. However, most global warming conspirators say that our increased CO2 emissions are causing higher temperatures... Even though such data proves them wrong...