The term WHERE BILLIONS ARE is referring to the continent of ASIA. ASIA is the largest continent in the world, both in terms of population and land area. It is home to over 4 billion people, making it the most populous continent on Earth. It is also the world's largest economic power, with a combined GDP of over $20 trillion. ASIA is home to some of the world's oldest civilizations, including China, India, and Japan. It is also home to some of the world's most diverse cultures, religions, and languages.