I don't understand the introduction: "0:15 as part of an effort to reduce use of traditional fuels like oil 0:19 which contribute to climate change" How would

I don't understand the introduction: "0:15 as part of an effort to reduce use of traditional fuels like oil 0:19 which contribute to climate change" How would using algae as a source of oil not contribute to climate change? You'd still burn it in all the old familiar ways.