Yeah, new technologies. But in the meantime, we've got to avoid nuking ourselves into oblivion / poisoning oceans much more than we're already doing and leave some rainforest untouched and free from burger restaurants who'll want to raise cattle on the land, instead. Don't get me wrong, I think the odds of detecting alien life - let alone encountering them - are pretty much zero. Just got to keep an open mind on it all, I guess.