LONDON (Reuters) – London is underprepared for the heatwaves, flooding and rising sea levels it is forecast to experience in coming years, a report commissioned by Mayor Sadiq Khan said on Wednesday. The report, which was ordered after soaring temperatures, wildfires and floods all hit the capital in recent years, said a “step change” in planning and investment was needed. “London has many good plans and programmes to prepare for climate hazards but we need to recognise that Londoners now face lethal risks,” the chair of the report, and former chair of the Environment Agency, Emma Howard Boyd …