i think that within the next 30 to 40 years the earth will hav no oil left to cool down the core causing our earth to heat up and then blow up from the inside.and i think this because the tuatara in the last 150 years we have been recording them thay hav not yet mated.....untill now they survived wot killd all the dinosors and it takes 20 years for a baby tuatara to mature to hav more babys so if every tuatara is mating ther numbers wil triple and i think ther mating to survive the next devastation