Developing countries tend to have some characteristics in common often due to their histories or geographies. For example, with regards to health risks, they commonly have: low levels of access to safe drinking water, sanitation and hygiene; energy poverty; high levels of pollution (e.g. air pollution, indoor air pollution, water pollution); high proportion of people with tropical and infectious diseases (neglected tropical diseases); a high number of road traffic accidents; and generally poor infrastructure. Often, there is also widespread poverty, low education levels, inadequate access to family planning services, many informal settlements, corruption at all government levels, and a lack of so-called good governance. Global warming (climate change) is expected to impact developing countries more than wealthier countries, as most of them have a high "climate vulnerability".