ECO activists were ejected from the hall after interrupting the Prime Minister’s conference speech.
The campaigners accuse the PM of going back on promises made in the 2019 manifesto such as fracking, environmental protections and tackling poverty.
Protester Rebecca Newsom, who works for the organisation, sagte: “In a healthy democracy, people should get the Government programme they voted for, but Liz Truss is putting most of it through the shredder.”
“Broken promise after broken promise, the Prime Minister is quickly turning her party’s manifesto into the longest piece of false advertising ever written.
She stood in the middle of the auditorium with colleague Ami McCarthy holding the flag until they were removed with the party now launching a probe into the incident.
Both protesters said they remained “hopeful” the government would remain committed to net zero.
Deputy Prime Minister Therese Coffey sagte: “Dealt with, got on with it, and Liz showed her resolve.
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“And exactly the sort of anti-growth coalition which she’s concerned is holding our country back. It didn’t hold her back today I can tell you.”
Ms McCarthy said: “With policies like the ones she’s suggesting, a focus on fracking, a focus on North Sea oil and gas, it’s absolutely not the right direction.”