Solar, wind, batteries, nuclear sound big but they are not environmentally neutral (massive and toxic mining of rare materials, noise, poluting production, toxic recycling, disruption of airflow).
Burning fosil fuels is dead-end way but do we want to make this planet a complete artificial wasteland full of solar panel, wind farm, battery and radioactive landfills because "we wanted to stop CO2 emissions at all costs"?
And as another poster already pointed out, biofuels are horribly poor in terms of energy produced per area. There's simply not enough land on the earth to produce enough biofuel to run our civilization.
For a most egregious example of this, see the ongoing disaster in Indonesia where pristine rainforests are cleared away to make room for palm oil plantations, so us Westerners can feel good about using biofuels. Heartbreaking.