"A lonely island in the middle of the South Atlantic conceals Charles Darwin's best-kept secret.
Two hundred years ago, Ascension Island was a barren volcanic edifice.
Today, its peaks are covered by lush tropical "cloud forest".
What happened in the interim is the amazing story of how the architect of evolution, Kew Gardens and the Royal Navy conspired to build a fully functioning, but totally artificial ecosystem."
The ash cloud produced by the eruption of a sub-glacial volcano in Iceland has brought chaos to the European air industry. Here we explain how and why the crisis developed.