The targets to curb pollution and restore nature have been delayed.
The deadline for setting targets to improve water, air and wildlife will not be met.
The failure to hit the deadline was embarrassing for the UK.
The prime minister is under fire for skipping the COP 27 meeting.
Mr Sunak has been accused of a failure of leadership for not attending the conference in Egypt.
Mr Sunak insisted that tackling climate change was important to him and that he was focused on domestic issues.
As his government grapples with economic turmoil at home, Mr Sunak's commitment to green goals is being questioned.
The UK's delegation would have been able to present the targets to other nations before the conference.
The Environment Act requires that at least one target be set in each of the priority areas.
The Environment Secretary said the government wouldn't be able to publish the targets by 31 October.
There was a significant public response to the government's consultation on the targets, which led to the delay.
The government received over 180,000 responses to the consultation, which asked for public feedback on its target proposals.
The responses needed to be analysed and carefully considered, but no new date was given for the publication of the targets.
She said that the targets will need to be approved by Parliament before they can be published.
When we can expect to see the final targets is a huge question mark.
Almost half of England's wildlife is in decline and more than one in 10 species is at risk of extinction.
The Green Party Member of Parliament wrote "Defra admits in a cursory statement slipped out this morning that it's failed to fulfill statutory duty to publish environment bill targets" This makes a difference.
The failure to meet the deadline was described by Jim McMahon as a huge embarrassment to them.
He said that this is yet another example of the Conservatives being all talk when it comes to the environment, but failing to provide the leadership and the action that is desperately needed.
The prime minister was asked by Ms Lucas about the government taking a "wrecking ball to nature".
Lord Lucas made a foul-mouthed response to the charity.
You lie. The Conservative peer said that there was no attack on nature.
According to a UN report, there is no credible pathway to keep the rise in global temperatures below a key threshold.
People all over the world would be at risk if the temperature goes past 1.5C.
Climate Minister Graham Stuart, who was reappointed to the role in Mr Sunak's shuffle, will no longer attend cabinet.
A review of the UK's goal to achieve net zero carbon emissions was announced last month.
A focus of the review was to ensure the UK's fight against climate change maximized economic growth, while increasing energy security and affordability for consumers and businesses.