Thanks for that. Yep - I think the widely (wildly) varying numbers are due to there being various models currently being explored. The paper I referred to was r

Thanks for that. Yep - I think the widely (wildly) varying numbers are due to there being various models currently being explored. The paper I referred to was recent but not "2020" recent. I'd also trust Gaffney's team's findings as the Lost Frontiers team are at the cutting edge of all this.