The US currently dedicates~40% of corn, and a similar fraction of soybean oil to biofuels already. So there's limited room to expand biofuels to support all the applications that we currently use liquid fuels for. My expectation is that shorter-range boats, intended for single-day travel, are likely to be electrified.

Looks like those have started to arrive downthread.

Yes, it takes a beefier backup system to power a heat pump than a furnace: it gets all its energy from the electricity.

You need that for pretty much every modern central heating system: they all use electricity for thermostats, fans, and pumps, even if the heat is generated using fossil fuels

They're usually more subtle than that, doing things like teaching people to experience psychosomatic illness in response to renewable energy.

In terms of climate, when food is grown, but then wasted, you've also burned fossil fuels to make fertilizer and transport the food, as well as possibly emitted methane during the growing of the food and its decomposition in a landfill. So waste reduction can have some real knock-on benefits in addition to feeding people, and be a part of how we lower overall emissions

The problem for Republican politicians is that if you give poor people a reason to vote, they won't support having all their money transfered into the pockets of the wealthy patrons who back the Republican party

What steps can countries take to limit the risk of climate-change-induced conflict between themselves and their neighbors?