fossil fuel, the world depends on this to get energy to do work, coal, a solid type of fuel that generate a lot of pollutants, crude oil, this black liquid is transported from all over the world to Singapore for fractional distillation to make things like petrol, natural gas, mainly methane gas, use in household and lab for burning and cooking, solar energy, renewable energy from the Sun, biomass, renewable energy from living things, hydropower, renewable energy from waterfall, carbon dioxide, a greenhouse gas given out by all living things when they respire

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