Not any fossil fuels now.

Fossil fuels in the liquid state is called oil, while those in the gaseous state is called natural gas. Breathing small amounts of gasoline vapors can lead to nose and throat irritation, headaches, dizziness, nausea, vomiting, confusion and breathing difficulties. Symptoms from swallowing small amounts of gasoline include mouth, throat and stomach irritation, nausea, vomiting, dizziness and headaches. Stop pumping fossil fuels now!