Abstract. The International Union of Geodesy and Geophysics (IUGG) has vigorously responded to a number of the natural, scientific, and technological challenges and driving forces that have marked the 21st century thus far. This paper reviews the actions of the Union that were precipitated by disasters caused by natural hazard events, climatic and environmental changes, and important scientific advances, as well as the opportunities to support International Years and other cooperative programs. This period has also given rise to a number of structural changes within the Union. IUGG added an eighth association, the International Association of Cryospheric Sciences, and inaugurated the new categories of affiliate and honorary memberships, introduced new grants, science education, and recognition programs, and formed new Union commissions on climatic and environmental change, data and information, planetary sciences, and a working group on history. Electronic communication was welcomed as a cultural norm. Overall, the development of the scientific landscape in the 21st century and a healthy future for the Union requires emphasis on fundamental Earth and space sciences as well as on transdisciplinary science to resolve urgent problems of society. IUGG will continue to evolve throughout the coming decades in step with the changing world of science and its international organizations, by responding to challenging problems as they arise.

中文翻译：

---

21世纪的IUGG

摘要。国际大地测量与地球物理学联合会（IUGG）积极应对了迄今为止标志着21世纪的许多自然，科学和技术挑战以及驱动力。本文回顾了自然灾害事件，气候和环境变化以及重要的科学进步所造成的灾难所导致的国际电联的行动，以及支持国际年和其他合作计划的机会。这一时期也引起了联盟内部的一些结构性变化。IUGG增加了第八个协会，即国际冰冻科学协会，并开创了新的会员和荣誉会员类别，引入了新的赠款，科学教育和认可计划，并成立了新的联盟委员会，负责气候和环境变化，数据和信息，行星科学以及历史工作组。电子通信作为一种文化规范而受到欢迎。总体而言，21世纪科学格局的发展以及国际电联的健康未来要求强调基础地球科学和空间科学以及跨学科科学，以解决社会的紧迫问题。IUGG将在未来几十年中随着不断变化的科学界及其国际组织的发展而不断发展，通过应对出现的挑战性问题。21世纪科学格局的发展以及联盟的健康未来需要强调基础的地球和空间科学以及跨学科科学，以解决社会的紧迫问题。IUGG将在未来几十年中随着不断变化的科学界及其国际组织的发展而不断发展，通过应对出现的挑战性问题。21世纪科学格局的发展以及联盟的健康未来需要强调基础的地球和空间科学以及跨学科科学，以解决社会的紧迫问题。IUGG将在未来几十年中随着不断变化的科学界及其国际组织的发展而不断发展，通过应对出现的挑战性问题。