catton: ththis is what it lookos lilike to be u underwater in a l kelp foresest. this is what we used to survey through, and today, where we are seeing this vast expanse of no bull kelp, the culmination of these--this persistent starvation is, in papart, due to an expapansion oe purple urcrchin population. and purple u urchins are a natural part of the system. we're seeing these urchins, which are little balls of spines, basically, with a mouth on the bottom that will start to form feeding fronts and mow down everything that they come across on the reef. lackey: it really started to change quickly. we saw a a lot more purple urchins.s. the kelp started to not look as healthy. we really starteted seeing the last k kelp, more urchins, a ani think there e were a lot of peoe surprised.d. man: when wewe started this urcn removal project, it was really small. it was justst a few peope that really wanteded to do something about ththe urchin exexplosion because the e depart hadn't been doing anything. we removed 57 7 tons of purple ururchins, between the recreationalal an

earlier, i spoke to howard catton, the chief executive of the international council of nurses. level of health worker infections. the who put it at about 23,000 globally, but that‘s based on 50 countries. we think it‘s much higher than that. we‘ve seen infection rates of 10—15% in italy and spain. we know from sars, it‘s up to 20%. tragically, we are also seeing reports of deaths of healthcare workers and nurses around the world. we believe over 100 nurses have tragically lost their lives. and the cause, a key cause, is the lack of protective personal equipment. but an additional major shortcoming we have is that countries are not collecting the data about health worker infections and health worker deaths in a standardised way. this isn‘t collecting data for data‘s sake. this will add to the science, so that we know who contracted the virus, when, how the disease may have progressed as well. we‘ve called on g20 leaders, we‘re calling on governments as well, they need to collect this data. what measures, counts. nurses and health workers count more than ever before. it‘s very ha

from geneva, i'm joined now by howard catton, the chief executive of the international council of nursess on bbc news. is there a pattern to the vulnerability of nurses and doctors fighting covid—19? are the obvious factors affecting at? we have been really concerned for a number of weeks about the level of health worker infections. the world health organization said about 23,000 globally, but that is based on 50, please. we think it is much higher night. —— 50 countries. we think it is ten to 50% in italy and spain. —— 1596. is ten to 50% in italy and spain. —— 15%. tragically, we have seen death of health care workers and nurses around the world. we believe over 100 nurses have lost their lives and a key cause is the lack of ppe but an additional major shortcoming we haveis an additional major shortcoming we have is that countries are not collecting the data about health worker infections and health worker deaths in a standardised way. this is not collecting data for data's sta ke, is not collecting data for data's stake, this will add to the science. we can know who contracted the vir