What would be the effect on the earth if the Himalayas were leveled?

There is not much impact on the whole earth, because the Himalayas are still too small compared to the mass of the whole earth, like clipping a fingernail off a human body. But the impact on the Himalayas around the region is still relatively large, especially in China's Qinghai-Tibet region, without the Himalayas block, the summer southwest monsoon will be able to penetrate into the Tibetan plateau, the climate will become humid. And the northern region of India due to the winter without the Himalayas blocking the winter winds, the temperature will be lower than now.