Tharoor was speaking at a session titled "Inglorious Empire" at the eighth edition of the Mountain Echoes literary festival here.
"We try to shake hands over the political divide, but the climate in the country has become mutually hostile, and such matters need to be bipartisan to succeed," he said.
He referred to an initiative he undertook to find a solution to deteriorating air quality in the country, especially in Delhi. He assembled a bunch of experts, including from NGOs, for the effort.
In matters like foreign affairs, however, all parties are largely on the same side, the Congress MP said.
More From This Section
"...As chairman of the foreign affairs committee, the external affairs committee of the Parliament, I would say on foreign policy issues we are largely bipartisan.
"I have always argued that there is no Congress foreign policy or BJP foreign policy, there is only Indian foreign policy. Remember, I chair a committee where majority of the members are from BJP... Nonetheless, we never had a disagreement or a dissent note," he said.
"The committee has witnessed 16 reports in the last three years. Like the report on India Pakistan relations? but there was no dissent, it was a unanimous report," said the prolific author of books such as "An Era of Darkness: The British Empire in India" and "Nehru: The Invention of India".
Discussing the representation of history, Tharoor noted that history had become "contested territory".
"History has become contested territory in our country, starting with the Ram Janmabhoomi movement. It was the first major nationwide effort to essentially and pretty crudely take revenge upon history.