Carbon neutralilty means that emissions are calculated in a transparent process and reduced. By offsetting the residual emissions, the net carbon emission balance of the country will be equal to zero.

Ecological footprint is an estimation of resource use over the whole life-cycle of a product.

El Niño Southern Oscillation (ENSO) is a natural climate variability in the Pacific region. In El Niño periods the Central and Eastern Pacific Ocean is warmer than average. In La Niña periods the Central and Eastern Pacific Ocean is colder than average. Easterly trade winds are stronger than normal.

Intergovernmental Panel on Climate Change (IPCC) is called an international board of scientist which summarizes every five years in a consensus report the scientific state of understanding of climate change, its Impact and options for adaption and mitigation.

Tuvalu is a series of nine low-lying coral atolls dispersed over 1.2 million km2 in the South Pacific within latitude 5-11° S and longitude 176-180° E. The islands have only an area of 26 km2. The highest point is around 5 meter above sea level. Tuvalu has a population of about 11,000 inhabitants. The capital atoll Funafuti is only 2.7 km2 and has about 5,300 residents.

Water scarcity is defined as lack of sufficient access to safe and affordable water for drinking, washing and livelihood. Most organisations define less than 1000 m3 water per capita per year as a situation of water scarcity. But also other scientific definitions of water scarcity do exist.

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