Which two human activities are believed to be the greatest contributors to global warming? nonnative species introduction and the burning of fossil fuels deforestation and the burning of fossil fuels deforestation and nonnative species introduction non-sustainable harvesting and nonnative species introduction

The primary cause of global warming is human activity that releases carbon into the Tropical deforestation, also by human hands, is another major contributor. sources, and how much comes from burning coal, oil and gas (called fossil fuels). shift of plant and animal ranges; Decline of some plant and animal species.

Explanation:

i hope this helps :)