Humans and other animals are shrinking and living shorter lives, is this because of 6G or the global warming thingy?

When life on Earth began 6025 years ago our ancestors towered above other creatures. The average human stood 234.7 feet tall and weighed in around 34 metric tons, the average life span was 600 years (this is probably why we got so big). Look at us now...what has caused this? However, even though things got bad for us compare and contrast this to the dinosaurs, 6000 years ago they were about a quarter of the size of humans but now they are all birds....for shame.