Herald: THE ocean is becoming more acidic because it is struggling to absorb the amount of carbon dioxide (CO2) we’re putting up into the atmosphere – and no one knows when the “tipping point” will come, when the ocean starts to expel CO2. That’s the chilling warning from department of environment affairs (Deat) climate change specialist Dr Ashley Johnson, who addressed a packed public meeting – organised by Deat, the Wildlife and Environment Society and Bayworld – in Port Elizabeth last …