The UK Prime Minister told the UN climate summit that the war in Ukranian was a reason to act fast.
He said that climate and energy security go hand-in-hand.
A group of leaders from 120 countries are in Egypt for a meeting.
Support for the most- affected countries is one of the key topics.
Climate change won't be affected by Putin's war in Ukraine and rising energy prices. Mr Sunak said that they are a reason to act fast.
Our children can inherit a more prosperous future. He said there is room for hope.
Despite the war in Ukranian and global financial problems, leaders urged rich countries to stay the course in stopping further climate change.
The impacts of climate change were laid out by nations on the front line.
The UN Secretary General told the summit that the world was on a road to climate hell.
His warning was echoed by former US vice-president and environmentalist Al Gore who said nations should stop subsiding the culture of death.
The president of France urged world leaders to address climate justice.
Boris Johnson, the former prime minister of the UK, is in Egypt.
Germany's Chancellor said it was a security policy imperative to switch to renewable energy, while Italy's prime minister said her country was committed to its climate goals.
Many other youth activists are in Sharm el-Sheikh despite the fact that Sweden's Greta Thunberg is not going to the summit.
A 20-year-old activist from Mexico is telling decision-makers that nature needs to be protected.
She said she's happy with progress so far in Egypt, and that she got the words "loss and damage" on the agenda. Money is used to compensate for the effects of climate change on developing countries that did not cause the problem.
"I'm worried that leaders aren't fully committed to climate action that focuses on justice or human rights."
Some climate solutions don't work for people. She said that it's not just about cutting emissions, but about people and the world we are creating.
The destruction wreaked upon this Earth in the past year was spoken of by the Prime Minister of Barbados.
The apocalyptic floods in Pakistan, the heatwaves from Europe to China, or indeed in the last few days in my own region, are just some of the examples. We don't have to repeat it.
The fact that the summit is taking place in Africa, a country that is vulnerable to climate change, was repeated throughout the day.
"Delay will make us busy spectators as calamity wipes out lives and livelihoods," said the president.
He said that 700 million people in Africa will be displaced by the year 2030.
The UN warned on Sunday that our planet is in danger.
The past eight years were on track to be the warmest on record according to a report.
A number of pledges were made at the summit.
Developing nations want previous pledges to finance to be upheld.
Climate change is seen as crucial if it is to be brought under control. More than 200 countries are attending the summit to discuss further measures to cut emissions and prepare for climate change, which could lead to major changes to our daily lives.