G20 demonstrators march in London

poverty - ubóstwo, bieda, nędza
climate change - zmiana klimatu
ahead of - przed (czymś/kimś)
Tens of thousands of people have marched through London demanding action on poverty, climate change and jobs, ahead of next week's G20 summit.

rally - wiec, zebranie zwolenników
The Put People First alliance of 150 charities and unions walked from Embankment to Hyde Park for a rally.

tense - napięty
BBC News reporter Mario Cacciottolo said people were clearly angry, but the atmosphere was not tense.

to dampen - studzić, zmniejszać
However, in an interview with Saturday's Financial Times, German Chancellor Angela Merkel dampened expectations of a significant breakthrough.

Źródło: http://news.bbc.co.uk/2/hi/uk_news/7968721.stm