Secret documents relating to the Transatlantic Trade and Investment Partnership (TTIP) trade pact being negotiated between the United States and the European Union have been leaked by environmental activist group Greenpeace.

The group managed to obtain around half of the draft texts produced ahead of the 13th round of TTIP talks in New York last week – around three-quarters of the consolidated texts where the EU and US positions on issues are shown side by side.

Of the documents released by Greenpeace Netherlands, which cover a total of 248 pages, 13 chapters for the first time show the position of the US.

The group is now warning that the deal could come with some harmful repercussions, especially when it comes to environmental and consumer protection.

Its main concerns include an apparent lack of long-standing environmental protections, with no reference to the General Exceptions rule that allows nations to regulate trade "to protect human, animal and plant life or health" or for "the conservation of exhaustible natural resources."

"The omission of this regulation suggests both sides are creating a regime that places profit ahead of human, animal and plant life and health," Greenpeace says.

It also argues that climate protection will be harder under TTIP, since "nothing indicating climate protection can be found in the obtained texts," and there is limited scope for mitigation measures.

The EU's precautionary principle, which protects consumers from potentially harmful products by forcing a manufacturer to prove the absence of danger from a product, also fails to receive a mention in the chapters obtained. Instead, the US's method of managing rather than avoiding hazardous substances, is mentioned.

"This approach undermines the ability of regulators to take preventive measures, for example regarding controversial substances like hormone disrupting chemicals," Greenpeace says.

It also sees the pact as potentially "opening the door for corporate takeover," by granting corporations the chance to "intervene at the earliest stages of the decision making process."

In response, the EU's top trading officials have denied any accusations of attempting to lower EU standards.

Cecilia Malmström, EU trade commissioner, said the consolidated texts "are not the same thing as an outcome" but merely reflect the negotiating position of each side.

And she pointed out that in the past year, the European Commission has opened up the negotiations "to make our positions on all matters in the negotiations public. After each negotiating round, we publish round reports as well as our position papers and textual proposals. So the positions of the EU are well-known and nothing new."

Separately, the two sides said they made progress in a number of areas at last week's talks.

Negotiations on small and medium-sized enterprise, or SMEs, customs and trade facilitation and competition "are at a very advanced stage"; agreement provisions on good regulatory practices, which would strengthen transparent rule-making on both sides of the Atlantic, saw "solid progress"; and discussions on developing the framework for regulatory cooperation were "fruitful."

Tariff elimination, a key US goal, also moved forward, US chief negotiator Daniel Mullaney said.

"We had agreed earlier to eliminate tariffs on 97% of tariff lines, and at this round, we worked to increase the number of those tariff lines that would be zeroed out upon entry into force of the agreement.

"In the months ahead, we will discuss the elimination of the remaining tariffs, and we will seek to accelerate the pace of reduction for tariff lines we have already agreed to phase out."