Science·What on Earth? Earth has a 27.5-million-year 'pulse' of major geological events, says study In this week's issue of our environment newsletter, we look at a new study on the 'pulses' of Earth's geological events and a Maritime company that makes Lego-style bricks made from recycled plastic. Social Sharing CBC News · (Sködt McNalty/CBC) comments Hello, Earthlings! This is our weekly newsletter on all things environmental, where we highlight trends and solutions that are moving us to a more sustainable world. ( Sign up here to get it in your inbox every Thursday.) This week: The worldwide demand for sand