Biofuels

Biofuels are made from recently living organisms, while fossil fuels are made of long-dead organisms from millions of years ago. 

Biofuels usually come from plants or algae, since they can photosynthesise and store energy inside themselves, biofuels are also cheap to make and are renewable,
we classify biofuels as carbon neutral, and we can combine fossil fuels with biofuels.

One of the biggest issues is that we need lots of lands to grow these biofuels, which means we normally need to convert natural land by digging and clearing forests, transporting the fuels and harvesting and processeing the biofuels thus making more C02.