I am not sure what warmer times they are talking about but this is pretty interesting. This planet has previously been a lot warmer and a lot colder than it is right now. Corals are tougher than some folks might think, which is fantastic news.
http://theaustralian.news.com.au/story/0,,22065659-30417,00.html?from=public_rss
http://theaustralian.news.com.au/story/0,,22065659-30417,00.html?from=public_rss