Climate change is influenced by numerous factors. Here are some key reasons:

1. Greenhouse Gases: The primary reason for climate change is the increase in greenhouse gases in the Earth's atmosphere. These gases trap heat from the sun and cause global temperatures to rise, an effect known as global warming. The most significant greenhouse gas is carbon dioxide, primarily produced by burning fossil fuels like coal, oil, and gas.

2. Deforestation: Trees absorb CO2, so when large areas of forests are cut down, the levels of carbon dioxide rise in the atmosphere.

3. Industrialization: Increased industrial activity leads to more greenhouse gas emissions, largely due to reliance on fossil fuel energy sources. 

4. Agriculture: Agricultural practices contribute to climate change in several ways, including the methane output from livestock and the nitrous oxide emissions from fertilized fields.

5. Waste Management: Landfills produce methane, a potent greenhouse gas, and when we burn waste, that can release CO2 into the atmosphere.

6. Energy Use: Our increasing demand for energy, especially in developing countries, leads to more burning of fossil fuels and more greenhouse gases.

7. Transportation: The transport sector is responsible for nearly a quarter of energy-related carbon dioxide emissions and this proportion is rising.

8. Urbanization: Rapid urban growth and development leads to more energy consumption and the creation of “urban heat islands.”

9. Changes in the Earth's Orbit: Natural shifts in the Earth's orbit can also influence the amount of solar energy that our planet receives, influencing long term climate patterns.

It's important to remember that while natural factors can influence climate change, the rapid pace and severity of change we're currently experiencing is largely due to human factors.
