extraterrestrial life; ET
terrestrial planet; telluric planet; rocky planet
earth orbit; geocentric orbit
earth-friendly; ecological; sustainable
earth science; geoscience
global citizen; citizen of the earth
prevention of global warming
earth station (for a satellite)
global environment problems; global environmental issues
global environment conservation; global environment preservation
earth observation (satellite, platform, etc.)
global problem; global issue
earth mass (astronomical unit of mass)
climate engineering; geo-engineering
Earth Similarity Index; ESI