* Carbon Dioxide (CO2): This is the most common greenhouse gas produced by burning fossil fuels. It traps heat in the atmosphere, contributing to climate change.

* Water Vapor (H2O): While not considered a pollutant, water vapor is released as a byproduct of combustion. The amount produced depends on the type of fuel and the efficiency of the burning process.

Let me know if you'd like to know more about other waste products or the environmental impact of burning fuels!