The nuclear agreement between Western powers and Iran was broadly welcomed by politicians, former world leaders and Middle East experts.
Sri Lanka is putting on a show ahead of Friday's Commonwealth summit - but it is being overshadowed by accusations of human rights abuses.
William Hague and his Friends of Syria counterparts have agreed to "provide urgently all the necessary material and equipment" to rebels.
William Hague dismissed accusations the Conservatives were no longer in touch with the country after the Prime Minister failed to answer a question about the price of a loaf of bread.
The Foreign Secretary told Daybreak there were "many different prices" for a loaf of bread and dubbed the query "a bit of a 1960's question".
Foreign Secretary William Hague said the IPPC's report "confirms that climate change is already happening, as a result of human activity".
"The IPCC's report makes clear that unless we act now to reduce carbon emissions, all this will continue to worsen in coming decades," he added.
US Secretary of State John Kerry called the findings "a wake-up call".
"Those who deny the science or choose excuses over action are playing with fire," Mr Kerry said, referring to sceptics who question the need for urgent action on climate change.
Iran must match its new talk of improving relations with the international community with actions, William Hague said after meeting his counterpart Mohammad Javad Zarif on the sidelines of the UN General Assembly in New York.
The Foreign Secretary urged Iran to take "concrete steps" to address concerns over its behaviour after talks which covered the country's nuclear programme, human rights and the conflict in Syria - where it supports the regime of President Bashar al Assad.
Mr Hague said after the meeting: "The United Kingdom does not seek a confrontational relationship with Iran and is open to better relations.
"The United Kingdom welcomes President Rouhani and Foreign Minister Zarif's recent statements about Iran's wish to improve its relations with the outside world.
"The time is now right for those statements to be matched by concrete steps by Iran to address the international community's concerns about Iran's intentions."
Sadly 3 UK nationals are among the known victims of the Nairobi attack. My condolences to their relatives and to all the bereaved families
Foreign Secretary William Hague said there are "undoubtedly British nationals" caught up in today's attack on a shopping mall in Kenya.
"We don't have any sufficiently precise details to give any further details of that at the moment - this is a fast-moving situation," Mr Hague added:
Foreign Secretary William Hague said the UK "condemns unreservedly this terrorist attack" on a shopping mall in the Kenyan capital of Nairobi.
Mr Hague said tonight that such attacks "will never weaken our resolve, or the resolve of the people of Kenya, to defeat terrorism."
– Foreign Secretary William Hague
All our thoughts are with the people of Kenya and with innocent people who may be caught up in this.
This is clearly a complex attack, clearly a terrorist attack, and a particularly callous, cowardly and brutal attack targeting innocent people of all ages and so many different backgrounds doing their shopping today.
The United Kingdom condemns unreservedly this terrorist attack and such attacks will never weaken our resolve, or the resolve of the people of Kenya, to defeat terrorism.
Foreign Secretary William Hague said there are "undoubtedly" British nationals caught up in the "callous, cowardly and brutal attack" on a mall in the Kenyan capital of Nairobi.
Foreign Secretary William Hague said the Government is "in close touch" with the Kenyan authorities about the attack on a mall in Nairobi.
Mr Hague wrote on Twitter:
We are in close touch with Kenyan authorities about the attack in Nairobi, our urgent priority is the welfare of UK nationals in #Kenya
UK ties with Kenya very close. Appalled by the attack and my thoughts are with everyone affected by it
The government is open to the idea of sending British experts to help with the task of seizing Syria's chemical weapon stockpiles, Foreign Secretary William Hague has said.
Speaking to BBC Radio 4's Today programme, he ruled out the idea of British troops being deployed to provide security, adding that such action might create strong feelings within Syria.
Under an agreement between the US and Russia, the Syrian regime is required to submit a full inventory of its chemical stockpile by the end of the week, allow international inspectors into the country by November and complete the surrender of its arsenal by mid-2014.
Foreign Secretary William Hague highlighted the importance of avoiding "evasions" from President Bashar al-Assad's regime on the chemical weapons handover.
He said: "It is important that there are no evasions, no cat and mouse game going on, on these weapons."
"We now have to have a resolution which crystalises a binding commitment and which makes sure this is dealt with credibly, reliably and promptly," he added.