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Global warming and the tipping point

Global warming is a contentious issue. Depending on one's point of view, causes and outcomes can be quite different. It is certain, however, that the earth is constantly changing, evolving into different sets of environmental conditions. The changes, interpreted as good or bad, are conditioned by perspective and personal impact. Geologists tend to take a long‐term view of environmental change, e.g. glacial–interglacial cycles and fluctuation of sea level. Global environmental change, such as planetary warming cycles, is triggered by tipping points related to planetary physics viz. the familiar luni‐solar cycles. A tipping point or critical moment may be abrupt or multiple, leading to pronounced changes in environmental conditions. Human beings have undeniable powers to damage the environment and to accelerate rates of change catastrophically. Yet Nature has a long‐term record for occasionally striking back. Whatever the present trend, the last word will always be political.