rising tensions as the brazilian amazon is opened up for more development. an indigenous leader is reportedly murdered by gold miners. and the tour de france has its youngest winner in more than 100 years, as the 22—year—old colombian egan bernal triumphs. hello and welcome to world news today. several people have been injured in pitched battles in hong kong after a third day of violent clashes between pro—democracy campaigners and riot police. some protestors had defied orders to disperse after an anti—government rally, setting up barricades and blocking streets, before rounds of tear gas were fired. this is the eighth week of demonstrations, sparked by a proposed new bill which would have allowed extradition to mainland china. although the plans were eventually shelved, mass protests continue, amid fears of a gradual erosion of freedoms at the hands of the authorities in beijing. our correspondent, nick beake, has sent us this report from hong kong. gunshots they say it's one of the safest cities you can find, a peaceful place. not today. not this

our main story: we have a special report from the amazon rainforest,

we have a special report from the amazon on the vital role played by its trees, as more and more are cut down.

there are the likes of spacex and elon musk and jeff bezos of amazon, in the private sector, they are pouring lots of money into space exploration, and so many people are saying, as you mention, this is reigniting that excitement for a new generation and hoping that the next 50 yea rs of generation and hoping that the next 50 years of space exploration will bring, finally, a lot more advancement than the last 50 jonathan mcdowell is an astronomer at the harvard—smithsonian —— a lot more than the last 50 yea rs. the moon preserves the events that happened billions of years ago, the geology on the earth, the atmosphere on the earth are wiped clean. we really learned a lot about how the role of asteroids bashing into one another and how the earth and the other planets, form scientifically, still working through, still papers being published from the apollo data. but, also, culturally, as a scientist, the idea of humans being on another world. the beginning of, if you like, the settlement of outer space, a star trek future in which we live on all kinds of different worlds, if that c