Some pollution, sure, but not all. One of the top causes of pollution and global warming is from meat production.And it's cheaper for multi-national companies from China to import pork from the US rather than slaughter them at home: https://qz.com/433750/the-world-eats-cheap-bacon-at-the-expe...
"It begs questions about the quality of life the world’s richest nation will tolerate for its poorer citizens, questions that have been thrown into sharp relief by the recent entry into North Carolina of China’s—indeed the world’s—largest pork processor, WH Group. Drawn by the low cost of production there, WH Group finds it cheaper to raise pigs in North Carolina and export them to tables back home than to raise the animals in China. "