function Generate_KML() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  ss.toast('Scanning your Google Contacts. Please wait..', 'Scan Started', -1);

  var contacts = ContactsApp.getContacts();

  // Standard header of the KML File
  var kml = '<kml xmlns="http://www.opengis.net/kml/2.2"';
  kml += '<Document><name>Google Contacts</name>';

  for (var i = 0; i < contacts.length; i++) {
    var name = contacts[i].getFullName();
    var addr = contacts[i].getAddresses(ContactsApp.Field.HOME_ADDRESS);

    // Get the Work Address if Home Address is unavailable
    if (!addr.length) addr = contacts[i].getAddresses(ContactsApp.Field.WORK_ADDRESS);

    if (addr.length) {
      addr = addr[0].getAddress();
      addr = addr.replace(/\n/g, ', ');

      // Get the Latitude, Longitude for the address
      var geocode = Maps.newGeocoder().geocode(addr);

      if (geocode.status == 'OK') {
        var point = geocode.results[0].geometry.location;
        addr = geocode.results[0].formatted_address;

        kml += '<Placemark><name>' + name + '</name><description><![CDATA[';
        kml += addr + ']]></description><Point><coordinates>';
        kml += point.lng + ',' + point.lat + '</coordinates>';
        kml += '</Point></Placemark>';
      }
    }
  }

  kml += '</Document></kml>';

  var attach = [{ fileName: 'address.kml', content: kml }];

  // Send the KML file as an email attachment to the current user
  GmailApp.sendEmail(Session.getEffectiveUser(), 'Google Contacts Map', 'Open the KML inside Google Earth', {
    attachments: attach,
  });

  // On-screen notification
  ss.toast('The KML file has been sent to your mailbox. Goodbye!', 'Done', -1);
}