Policy changes can potentially be reversed or scaled back if needed, whereas many
adverse changes in the climate system would be difficult or impossible to «undo».
This activity report consists of a fact sheet presenting UN
system's concerted activities to help people and communities
in countries, especially those particularly vulnerable to the
adverse effects of
climate change, to manage
climate - related risks
in their efforts to achieve sustainable socio - economic development.
Climate impact concerns include environmental quality (e.g., more ozone, water - logging or salinisation), linkage
systems (e.g., threats to water and power supplies), societal infrastructures (e.g.,
changed energy / water / health requirements, disruptive severe weather events, reductions
in resources for other social needs and maintaining sustainable livelihoods, environmental migration (Box 7.2), placing blame for
adverse effects,
changes in local ecologies that undermine a sense of place), physical infrastructures (e.g., flooding, storm damage,
changes in the rate of deterioration of materials,
changed requirements for water or energy supply), and economic infrastructures and comparative advantages (e.g., costs and / or risks increased, markets or competitors affected).