The phrase "raised ambitions" is correct and usable in written English.
You can use this phrase when you want to emphasize that someone has increased their goals or aspirations. For example: His hard work and dedication has raised his ambitions for success.
Whilst there is not yet clarity over the policies the US will pursue to deliver the raised ambition from 2020 to 2025, President Obama's use of executive orders to make carbon cuts through to 2020 (that do not require Congressional approval) means that unless the Republican Party win the Presidency in 2016 it is very difficult to see how they could stop the progress that Obama is delivering.
BONN, Germany, May 21 (Reuters) - Reluctance to raise ambitions to cut greenhouse gas emissions due to economic constraints is threatening progress towards limiting global warming, delegates at United Nations' climate talks in Germany warned on Monday.
Must continue raising ambition.
We need high-level political commitment to raise ambition".
But in Marrakech, countries still sent out strong political signals about raising ambition while getting on with the job of cutting emissions.
The UK needs to do more together with other donor countries but this is a significant gesture to raise ambition, and especially during a time of austerity," she said.
"We think it is better to confront that fact now and focus on ensuring that the Paris agreement includes a mechanism for raising ambition after the summit, while also encouraging countries to go further in their INDCs".
The UN climate change chief, Patricia Espinosa, said: "This is an extraordinary momentum by nations and a clear signal of their determination to implement Paris now and raise ambition over the decades to come".
Announcing his acceptance of the position, Prescott said: "My brief is to raise ambition on this crucial issue and I am proud to help the man I hope will be the next prime minister so that together we can help the next generation".
