These animals were not as sensitive to climatechanges in the Cretaceous period as they are today.
这些动物在白垩纪对气候变化不像今天这样敏感。
2
Bones disintegrate, the land erodes, the climatechanges, forests come and go, rivers change their course — and history, if not destroyed, is steadily concealed.
骨头分解，土地侵蚀，气候变化，森林重生，河流改道——而历史，如果没有被摧毁，也会被逐渐掩盖。
3
Reconstructing the climatechanges of the past is extremely difficult, because systematic weather observations began only a few centuries ago, in Europe and North America.