Brazilian sugarcane ethanol as an expandable green alternative to crude oil use

Biofuels have lower CO 2 emissions than fossil fuels, but competing land demands can limit expansion of production. This study shows Brazilian sugarcane ethanol could displace up to 13% of global crude oil consumption by 2045 whilst balancing forest conservation and future land demand for food. Reduction of CO 2 emissions will require a transition from fossil fuels to alternative energy sources. Expansion of Brazilian sugarcane ethanol 1 , 2 provides one near-term scalable solution to reduce CO 2 emissions from the global transport sector. In contrast to corn ethanol, the Brazilian sugarcane ethanol system may offset 86% of CO 2 emissions compared to oil use, and emissions resulting from land-use change to sugarcane are paid back in just 2–8 years 3 , 4 . But, it has been uncertain how much further expansion is possible given increasing demand for food and animal feed, climate change impacts and protection of natural ecosystems. We show that Brazilian sugarcane ethanol can provide the equivalent of 3.63–12.77 Mb d −1 of crude oil by 2045 under projected climate change while protecting forests under conservation 5 and accounting for future land demand for food and animal feed production. The corresponding range of CO 2 offsets is 0.55–2.0 Gigatons yr −1 . This would displace 3.8–13.7% of crude oil consumption and 1.5–5.6% of net CO 2 emission globally relative to data for 2014 6 , 7 .