单选题：Text 3Worid leaders met recently at United Nations headquart

Text 3
Worid leaders met recently at United Nations headquarters in New York City to discuss the environmental issuesraised at the Rio Earth Summit in 1992. The heads of state were supposed to decide what further steps should betaken to halt the decline of Earth's life-support systems. In fact, this meeting had much the flavour of the originalEarth Summit. To wit: empty promises, hollow rhetoric, Bickering between rich and poor, and irrelevant initia-tives. Think U. S. Congress in slow motion.
Almost obscured by this torpor is the fact that there has been some remarkable progress over the past fiveyears--real changes in the attitude of ordinary people in the Third World toward family size and a dawning realisati-on that environmental degradation and their own well-being are intimately, and inversely, linked. Almost none ofthis, however, has anything to do with what the bureaucrats accomplished in Rio.
Or it didn't accomplish. One item on the agenda at Rio, for example, was a renewed effort to save tropical for-ests. (A previous UN-sponsored initiative had fallen apart when it became clear that it actually hastened deforesta-tion. )After Rio, a UN working group came up with more than 100 recommendations that have so far gone no-where. One proposed forestry pact would do little more than immunizing wood-exporting nations against trade sanc-tions.
An effort to draft an agreement on what to do about the climate changes caused by CO2 and other greenhousegases has fared even worse. Blocked by the Bush Administration from setting mandatory limits, the UN in 1992called on nations to voluntarily reduce emissions to 1990 levels. Several years later, it's as if Rio had never hap-pened. A new climate treaty is scheduled to be signed this December in Kyoto Japan, But governments still cannotagree on these limits. Meanwhile, the U. S. produces 7% more CO2 than it did in 1990, and emissions in the de-veloping world have risen even more sharply. No one would confuse the "Rio process" with progress.
While governments have dithered at a pace that could make drifting continents impatient, people have acted.
Birth-rates are dropping faster than expected, not because of Rio but because poor people are deciding on their ownto reduce family size. Another positive development has been a growing environmental consciousness among thepoor. From slum dwellers in Karachi, Pakistan, to colonists in Rondonia, Brazil, urban poor and rural peasants a-like seem to realize that they pay the biggest price for pollution and deforestation. There is cause for hope as well inthe growing recognition among business people that it is not in their long-term interest to fight environmental re-forms. John Browne, chief executive of British Petroleum, Boldly asserted in a major speech in May that the threatof climate change could no longer be ignored.
根据以上材料，回答题。
The writer's general attitude towards the world leaders meeting at the UN is __________. A．supportive
B．impartial
C．critical
D．comedic