The main causes of global warming are:

Greenhouse Gas Emissions:
Carbon dioxide (CO2) – The primary greenhouse gas, primarily produced by the burning of fossil fuels (e.g., coal, oil, natural gas) for energy, transportation, and industrial processes.
Methane (CH4) – Produced by agriculture (especially livestock), landfills, and energy production.
Nitrous oxide (N2O) – Released from fertilizers, industrial processes, and combustion of fossil fuels.
Fluorinated gases – Used in refrigeration, air conditioning, and industrial processes.
Deforestation and Land Use Changes:
Cutting down and clearing forests reduces the number of trees that can absorb and store CO2 from the atmosphere.
Converting land for agriculture, urbanization, and other human activities also contributes to increased greenhouse gas emissions.
Increased Agricultural Activities:
Livestock farming, particularly of ruminant animals like cattle and sheep, generates significant methane emissions.
Intensive agriculture practices, including the use of fertilizers, also lead to nitrous oxide emissions.
Industrial Processes:
Manufacturing, chemical production, and other industrial activities release greenhouse gases as byproducts.
Cement production is a major contributor of CO2 emissions.
Transportation:
Burning of fossil fuels for vehicles, ships, and air travel leads to significant CO2 emissions.
Energy Production:
The burning of fossil fuels (coal, oil, natural gas) for electricity generation is a major source of CO2 emissions.
The accumulation of these greenhouse gases in the atmosphere traps heat and leads to the observed global warming trend over the past century. Addressing these primary causes is crucial for mitigating climate change.