According to the news, ______.

U.S. President Barack Obama says inaction on climate change could leave future generations with an "irreversible catastrophe". Mr. Obama called on global leaders Tuesday to move "boldly, swiftly, and together" to combat the problem. (28) Mr. Obama addressed world leaders gathered in New York City for a climate change summit called by U.N. Secretary-General Ban Ki-moon. (28)Mr. Ban opened the meeting by saying it would be "morally inexcusable" not to act. In his address, President Obama said the security and stability of each nation and all peoples are in jeopardy and that time is running out to reverse the effects of climate change. But Mr. Obama said the current trend is reversible.
    More than 90 heads of state are attending the meeting. Officials hope to make progress toward a global climate treaty that governments plan to finalize during a December meeting in Denmark.