She also called upon the world body to pass the Comprehensive Convention on International Terrorism (CCIT) to end Pakistan sponsored terrorism.
"Schools all over India had observed two minutes of silence in their memory".
He said that Kulbhushan Jadhav, a commander of the Indian navy, confessed to his involvement in terrorism in Pakistan.
The Peshawar attack was carried out by heavily-armed 8-10 Taliban suicide bombers who stormed the army-run school and took several hostages.
The foreign minister also briefed the United Nations chief on atrocities committed by Indian occupying forces in the valley.
Gambhir tore into Pakistan's claim that it has turned the tide against terrorism, saying a fact-check of this claim will give a different picture.
On climate change, Swaraj said underdeveloped and developing nations were "the worst victims" of the problem, adding, "they neither had the capacity nor the resources to meet this crisis".
Julie Swetnick Photos: Full Story Of Brett Kavanaugh Accuser
Swetnick said she's "one of the first 100 women in the world to achieve a Microsoft Certified Systems Engineering Certification". He also sent the statement to the committee on Wednesday, calling for the confirmation process again to be delayed.
The External Affairs Minister said, while the mastermind of 9/11 Osama Bin Laden was found and brought to justice in Pakistan, the mastermind of 26/11 Mumbai terror attacks Hafiz Saeed is at large in Pakistan and is eulogised and is being allowed to contest elections and is allowed to threaten India openly. Also, in the last session of the UNGA, Pakistan's former PM Abbasi had drawn the global community's attention to the Human Rights Violations in the Kashmir Valley.
A significant section of Swaraj's speech was, however, focused on terrorism emanating from Pakistan - slamming the country by name for being a "spawning ground for terrorism" and a violator of human rights due to its support of the menace.
External Affairs Minister Sushma Swaraj said today that the biggest challenges the world faces now are climate change and terrorism.
She claimed that India, hours after agreeing to a meeting between Pakistani and Indian foreign ministers in NY on a proposal of Prime Minister Imran Khan, had cancelled the event because "news came that terrorists had killed three of our jawans".
The Minister said, New Delhi believes that talks are only rational means to resolve the most complex of disputes and talks with Pakistan have begun many times.
# On Pakistan's allegation of sabotaging peace talks: "We are accused of sabotaging the process of talks".
"They preferred politics over peace", he had said. However, India called off the meeting last week citing the brutal killing of three policemen in J&K and Islamabad releasing postage stamps "glorifying" slain Kashmiri militant Burhan Wani, Indian Express reported.
"For a new vision to materialise, Pakistan must demonstrate that it has moved beyond a narrative of deception, deceit and distortion", Gambhir said. He said the UN Secretary General will soon visit India and Pakistan.