[Lawtan]

...I hate to say that the chances of us finding a life-bearing planet before that issue...would be slim. Mainly because most earth-like planets are thousands or millions of lightyears away. (We'd be better off taking over the known solar system at present, I think)

The Dyson sphere has the issue of "has no real design yet" - but if Britain gets it on with sustainable fusion, that could change. :D