A huge reduction in solar output is predicted to occur by then.

Thankfully, they mean sunspot activity, not heat output, though the lack of sunspots will likely cause some noticeable weather changes.
(http://www.space.com/19280-solar-act...h-climate.html)

If things do get worse, then hopefully by 2030 we'll have got better at scratching around in weak conditions, so we'll be sorted.