President Donald Trump is set to make his first speech at the United Nation’s General Assembly on Tuesday, with a major theme: the need for a ‘more sustainable, more inclusive’ global approach to agriculture.

The US leader is expected to take up his position as the world’s longest-serving UN secretary general after a whirlwind three-day trip to Asia.

While the president is unlikely to get into much detail, he is expected talk of a ‘world of food’, with his emphasis on global agriculture and the need to move towards a more sustainable, less exclusive agricultural system.

The first day of his three-city, six-nation trip began with a meeting with Chinese President Xi Jinping in Washington DC.

‘The Chinese government is working hard to make the world a more inclusive place,’ Trump said, referring to his first bilateral meeting with the Chinese leader.

‘I will do everything I can to make sure we make a better world for everybody.’

Trump is expected at the start of his speech to address the UNGA on Tuesday evening, but his address could be delayed by the threat of US withdrawal from the Paris climate agreement.

China and the US are set to launch their next round of talks in the US next month.

A ‘more inclusive’ agricultural system is expected in his speech Trump said he ‘would also encourage all nations to work towards a new international agreement on agriculture, and to make it a global agreement, so that farmers and other producers everywhere can grow food and enjoy the fruits of their labours.’

The president is also expected to raise the issue of global food security, a theme he has championed since taking office in January.

‘Global food security and climate security are at the heart of what I believe is the most important global challenge of our time: ensuring the health of our planet, and protecting our children’s childrens future,’ he said.

‘Our countries must work together to address these challenges.

It is in that spirit that I am sending a message to the world today: We must work towards building a more diverse, sustainable, and inclusive world, where we build and grow and flourish, with the world at our core.’

Trump has repeatedly criticized US agricultural policies in the past, calling them ‘unfair’, ‘stupid’ and ‘not sustainable’.

‘Agriculture has always been a global business,’ Trump added.

‘Agra has always depended on the markets, the markets have always driven our success.

But the market has also become more global.

‘We must all work together, and work together toward a sustainable, inclusive global agriculture system.

That will be an economic engine of growth and opportunity for all, for all of humanity, and for all time.’

‘Agritourism has always created jobs and prosperity and prosperity for the people who work in it,’ he added.

A climate change strategy in his first address to the UN General Assembly was also one of his major pledges.

‘Climate change is the biggest threat to our planet and the greatest threat to humanity,” he said in his opening remarks.

‘To avert the worst effects of climate change, we must work to stop it, and prevent the worst damage to the livelihoods of the poorest people on earth.

‘But no solution can be complete without addressing the root causes of climate disruption, which include pollution, waste, and degradation of the earth and its ecosystems.

‘These challenges cannot be solved by tinkering with the rules of the game, or by making temporary fixes, but only by addressing the fundamental causes of the climate crisis.

‘And that is what we are doing: We are working with governments and business leaders around the world, building an economy that works for the planet, not just the 1 percent.’

The US president has previously voiced concerns about global warming and the effect of the Paris accord on his first foreign trip, which he held in July.

‘If we do not act now, the Earth is going to be uninhabitable by the year 2050,’ Trump told an audience in Italy.

‘Unless we act, the world will be in trouble.’

Trump’s visit to China followed his visit to Vietnam in July, which included a meeting in Beijing with Chinese Premier Xi Jinping and a tour of the country.

The White House press secretary said the two leaders ‘focused on the common goals of economic growth, climate stability, and a free and open Indo-Pacific region’.

‘We are hopeful that they will reaffirm their commitment to these core values, and continue to support the transition to a more global economy,’ Spicer said.

Trump and Xi had a ‘close and productive meeting’ and are ‘commiting to working together to achieve a world of prosperity and opportunity,’ Spicer added.