The steakhouse stack, with two beef paties, crispy onions and peppercorn sauce is the kind of McDonald's you take photos of to put pride of place on the mantelpiece.

Sure you'll need to make room.

But you remember what your wedding day looked like.

The steakhouse stack, it's McDonald's and then some.

Available into the sixth of February, sir from 11 a.m. subject to availability,

participating restaurants only.

This is open to debate. I'm John Don Van. Some of our best debates have been those where we've peered over the horizon at coming technological breakthroughs like genetic engineering or artificial intelligence, and we have asked just because we can does that mean we should.

Now there's another potentially life-changing technology on the horizon.

Solar geoengineering.

It's known also as solar radiation modification or management, and it's a proposed set of technologies

that aim to reflect some sunlight away from the Earth and to reduce the inflow of solar energy thereby partially reducing

global temperatures. Basically it's suggesting that the amount of heat that we get from the

sun can be controlled. This includes ideas like putting reflective materials on your roof

or putting mirrors into orbit or injecting aerosols into the stratosphere to effectively

act like kind of a global sunblock. You get the idea. The question is, are these

ideas feasible? And if they're feasible, are they desirable? We have two teams of two experts

who spent years thinking about this topic to argue for and against this question.

Is engineering solar radiation a crazy idea?

This debate was taped live in New York City in 2019 and since then, well well everyone is still arguing about it in January

2022 a group of scientists and scholars from all over the world including one of

our debaters signed an open letter calling for a worldwide pause on all exploration of solar

geoengineering. A year later, February 2023, there was another open letter

...