Lomborg analyzes three major themes: life expectancy, food and hunger, and prosperity, finding that life expectancy and health levels have "dramatically" improved over the past centuries, even though several regions of the world remain threatened, in particular by AIDS. He dismisses Thomas Malthus' theory that increases in the world's population lead to widespread hunger. On the contrary, Lomborg claims that food is widespread, and humanity's daily intake of calories is increasing, and will continue to rise until hunger's eradication, thanks to technological improvements in agriculture. However, Lomborg notes that Africa in particular still produces too little sustenance, an effect he attributes to the continent's dismal economic and political systems. Concerning prosperity, Lomborg argues that wealth, as measured by per capita GDP, should not be the only judging criterion. He points to improvements in education, safety, leisure, and ever more widespread access to consumer goods as signs that prosperity is increasing in most parts of the world.