Here’s a still more precise rendering, this time of emissions irrespective of national boundaries. In the U. S., India, and China, areas of heavy emissions correspond to areas of dense 11. p. In the case of Germany, you can make out the valley of the Rhine River, the industrial heart of Europe.

Population.

Explanation:

U.S., India, and China, are the areas of heavy emissions of carbondioxide gas due to areas of dense population. These three countries have about half of the world  population i. e. approx. 3 billions of people so vehicles and industries are high in number which releases the greenhouse gases such as carbondioxide and carbonmonoxide while heavy emissions of carbondioxide gas occurs from Germany because there is huge number of industries are there so that's why it is called the industrial heart of Europe.