Rearrange the following types of biofuels in descending order based on their generation (1st generation to 4th generation):
1. Algae-based biofuels
2. Bioethanol from sugarcane
3. Cellulosic ethanol
4. Biodiesel from vegetable oils
1
4, 2, 3, 1
2
1, 3, 4, 2
3
2, 4, 3, 1
4
4, 3, 2, 1