The diagram shows the mass of carbon dioxide used and produced during one year - Edexcel - GCSE Biology - Question 3 - 2015 - Paper 1

The total mass of carbon dioxide used is given as 788 billion tonnes.

From the data:

• Carbon dioxide used: 788 billion tonnes
• Carbon dioxide produced by plants and land: 444 billion tonnes
• Carbon dioxide produced by the ocean: 330 billion tonnes.

Thus, the total carbon dioxide produced is calculated as follows:

Total carbon dioxide produced = Carbon dioxide used + Total carbon dioxide produced by plants and land + Total carbon dioxide produced by the ocean.

So:

Total carbon dioxide produced = $788 + 444 + 330 = 797$ billion tonnes.

One effect of an increase in the mass of carbon dioxide produced in the atmosphere is that it can lead to more heat being trapped in the Earth's atmosphere, resulting in global warming.

Plants remove carbon dioxide from the atmosphere through the process of photosynthesis. They use carbon dioxide to produce glucose and carbohydrates, which are essential for their growth and energy.

1. Increasing the use of renewable energy sources such as solar, wind, and hydroelectric power to reduce reliance on fossil fuels.
2. Promoting afforestation and reforestation efforts to enhance carbon sequestration through plant growth.