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Is it true that biofuels reduce the total carbon dioxide content in the atmosphere?

Biofuels are made from living organisms, such as trees. As these trees grow, they take up and filter carbon dioxide. However, when they are later used as biofuel, the trees release carbon dioxide.

In simple terms, the purification and the emissions are equal in size and therefore cancel each other out. The sum of added carbon dioxide is therefore zero, i.e. neutral. But in reality, it is difficult to completely neutralise the biofuels, as they also need to be processed (you cannot simply put a tree in the fuel tank of a car. The trees need to be felled, transported and made into fuel and all of this requires energy).

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