Without oil and gas and coal (meaning - if they all disappear today), modern world as it looks today ceases to exist. The death toll would probably be in the bi

Without oil and gas and coal (meaning - if they all disappear today), modern world as it looks today ceases to exist. The death toll would probably be in the billions, and standard of living for people who survive could be potentially worse than in middle ages. So yeah, fossil fuels are essential to our security.