The United States has been the major producer of greenhouse gases for most of the last hundred years and thus a principal cause of the adverse changes that are altering the global environment.

过去一个世纪的绝大多数时间里，美国已经成为温室气体最主要的产生者，因此应该对全球气候的不利改变担负主要责任。

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The changes of environment and climate are major subjects of global change study field.

环境与气候的变化是全球变化研究领域的中心课题。

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And we look forward to the future as we respond to the rapid changes in the global ICT environment.

我们展望未来，并不断适应瞬息万变的全球ICT大环境。

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In an environment where changes in global supply chain can be as sudden as they are unscripted, companies have to arm themselves with both foresight and peripheral vision, an understanding of the long-term, and agility to deal with the short-term.

FORBES: Ash In The Supply Chain

Changes in the global threat environment allowed subsequent Administrations to make adjustments to the two-and-a-half-war standard.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2

At the simplest level Future Earth must answer fundamental questions about how and why the global environment is changing, what are likely future changes, what the implications are for the wellbeing of humans and other species, what choices can be made to enhance resilience, create positive futures, and to reduce harmful risks and vulnerabilities, and how this knowledge can support decisions and sustainable development.

UNESCO: Biodiversity Initiative