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it's the most significant city to have fallen into russian hands since mariupol. for the third time this week, thousands of members of the rmt union have been taking part in a one day strike causing disruption to rail services across britain. good evening and welcome to bbc news. borisjohnson has insisted that questions over his leadership have been settled and that he will lead the conservative party into the next general election. his comments follow the tories�* defeat in two by—elections this week. speaking to the bbc from rwanda, where he's attending a commonwealth meeting, ...

norway cancels this year's oslo pride parade, after a deadly shooting at a gay nightclub, which police are treating as an act of �*islamist terrorism'. and sir paul mccartney — the star of glastonbury — on stage in front of a massive crowd. hello and welcome if you're watching in the uk or around the world. watching in the uk in a breakthrough for president putin, russian forces have taken control of severodonetsk. the city occupies a key location in the east of ukraine. kyiv pulled out forces after ferocious russian attacks. weeks of heavy shelling have reduced the city to rui...

Are being placed in the upper part of the atmosphere can stay there a lot longer than if they are released at the surface, and in addition, it can get more incoming radiation because it is higher in the atmosphere. is a comparison to air travel useful or not? how do emissions from space flights compare, say, to a long haulflight? it is important to note that, at the moment, the overall climate impact of the aviation industry is still significantly larger. this is because the aviation industry releases a lot more carbon dioxide, which is a greenhouse gas. the concern with the soot particles is ...

Looks like it's about to really get going. we are particularly concerned about the impact of such particles that come from rockets, especially those that have hydrocarbon bases. the reason they are so important is that when they are in high atmosphere by the rockets, they are much more efficient at warming the planet than other sources of soot foster you have looked specifically at these soot particles, tell us more about that impact and what you found in your study —— sources of soot. the soot particles are made up of carbon, they are small particles, less than the width of a human hair b...

Are released to the surface. in addition, it can get more incoming radiation because it is higher in the atmosphere. i5 radiation because it is higher in the atmosphere. is a radiation because it is higher in the atmosphere. is a comparison to air travel useful _ the atmosphere. is a comparison to air travel useful or _ the atmosphere. is a comparison to air travel useful or not? _ the atmosphere. is a comparison to air travel useful or not? how - the atmosphere. is a comparison to air travel useful or not? how do - air travel useful or not? how do emissions from space flights compare, say, to...