Which of the following countries has the highest ecological footprint?

The correct answer is China.

 Key Points

• The ecological footprint is the only metric that measures how much nature we have and how much nature we use.
• The ecological footprint adds up all the productive areas for which a population, a person or a product competes.
• It measures the ecological assets that a given population or product requires to produce the natural resources it consumes (including plant-based food and fibre products, livestock and fish products, timber and other forest products, and space for urban infrastructure) and to absorb its waste, especially carbon emissions. 
• China's physical quantity of ecological footprint in 2018 was 4.03 gha.
• China had the largest total ecological footprint of any country because of its huge population.

Therefore, the correct answer is China.