According to a 2002 ecological study published by the Heinz Foundation and the 2005 Millennium Ecosystem Assessment, scientists have less than half of the basic ecological data they need to evaluate the status of ecosystems in the United States.
據2002年出版的生態學研究的海因茨基金會和2005年千年生態系統評估，科學家在美國只有不到一半的基本生態數據，以評估他們所需要的生態系統狀態。
Even fewer data are available for most other parts of the world.
甚至對大多數世界其他地區擁有更少的數據。
Ecologists call for a massive program to develop baseline data for the world's ecosystems.
生態學家呼籲 建立一個大規模開發項目的基線數據為世界上的生態系統。
This chapter applied two of the scientific principles of sustainability by which natural ecosystems have been sustained over the long term.
本章適用於兩個科學可持續性原則，其中自然生態系統已被長期維持。
First, almost all of them use solar energy as their energy source.
首先，幾乎所有的人都使用太陽能作為能源。
Second, they recycle the chemical nutrients that their organisms need survival, growth, and reproduction.
其次，化學養分循環，生物體需要生存，生長和繁殖。
