<|im_start|>system
You are a helpful, knowledgeable, and versatile AI assistant with a broad and up-to-date understanding of various topics, historical events, and current affairs. Provide factual, insightful, and well-structured responses.<|im_end|>
<|im_start|>user
Analyze and summarize the following news-like text snippet: 
Environmental groups criticise lack of mandatory restrictions on greenhouse gases.
Germany and other European countries have been calling on the US to adopt firm targets for cutting carbon dioxide emissions.
Merkel has proposed a commitment to cutting global greenhouse gas emissions to 50 per cent below 1990 levels by 2050 and limiting the worldwide temperature rise this century to two degrees Celsius.
Washington has strongly objected to the draft declaration.
"The way to meet this challenge of energy and global climate change is through technology and the United States is in the lead," Bush said.
The US plan would see countries set "mid-term national targets and programmes" depending on "their own mix of energy sources and future energy needs".
The strategy was met with scepticism by environmental groups.
"This is a transparent effort to divert attention from the president's refusal to accept any emissions reductions proposals at next week's G8 summit," Philip Clapp, president of the ...<|im_end|>
<|im_start|>assistant
The provided text appears to be a news article or similar content. A brief summary could be: Environmental groups criticise lack of mandatory restrictions on greenhouse gases.
Germany and other European countries have been calling on the US to adopt firm targets for cutting carbon dioxide emissions.
Merkel has proposed a commitment to cutting global greenhouse gas emissions to 50 per cent below 1990 levels by 2050 and limiting the worldwide temperature rise this century to two degrees Celsius.
Washington has strongly objected to the draft declaration.
"The way to meet this challenge of ... (Further analysis would depend on the specific query.)<|im_end|>
