About 1 million years ago, they migrated to the tropical forest of Java where they took advantage of the bamboo to survive and make tools, and to the northern climate of China where they had to be more aware of the cold weather and protect themselves with some clothing against the freezing climate.
Homo Sapiens:.
Homo Sapiens evolved after the Homo Erectus about 300,000 to 400,000 years ago in Africa. Homo Sapiens are known to be much smarter than the Homo Erectus; their brains were quite bigger, so that they had the ability to make better tools and adapt to the most demanding weathers and ecosystems throughout the world. After being in Africa, eventually, they started migrating to the Middle East, Europe, and Asia where they replaced Homo erectus population. Later on, Homo Sapiens Neandertanlensis (135,000 - 30,000 KYBP) were able to flourish in both warm and glacial periods of time. They were the first humans to live in Ice Age conditions; they were able to survive by attaching to a large game hunting, mainly the indistinguishable Pleistocene mammals - the mammoth, wooly rhinoceros, and wild cattle.
It is not less important to mention the relevance that technology and social organization had for their success among a huge variety of ecosystems present at that time. The technology in each of the species had a distinct level of importance for their survival and adaptation to a different environment than where they might have been previously. For the Homo Habilis, the Oldowan Tools gave them a lot of advantages to get a more meat-based diet, which contained more proteins and probably helped to a achieve that growth of the brain in upcoming species. For the Homo erectus, the Achulean tools, Baton Percussion, and early blade tools, in addition to their bigger brains, gave them more capacity to hunt bigger mammals and include that as part of their meals. And for the Homo Sapiens, their endless technology advancement, compared to their ancestors, was a huge step that helped them to adapt to tougher ecosystems and to survive depending more in large game hunting.