Issues such as air pollution, climate change, land use management, and urbanization have increased demand for professionals in environmental fields. More corporations and governments are interested in sustainability, so sustainability consultants and those in related areas are in high demand. Meanwhile, the earth's population is growing, so organizations are hiring environmental scientists to study how this growth affects the planet. Some parts of the world need water conservation experts and hydrologists to provide ideas for access to clean water, while food scientists can find work trying to provide nutritious food for the growing population of the world.