Hosted by the world-renowned geneticist and environmentalist, David Suzuki, every week presents stories that are driven by a scientific understanding of the world.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | September 1966 | October 2007 | 37 |
| Season 1 | November 1960 | April 1961 | 25 |
| Season 2 | January 1962 | July 1962 | 24 |
| Season 3 | January 1963 | June 1963 | 25 |
| Season 4 | May 1964 | August 1964 | 11 |
| Season 5 | January 1965 | March 1965 | 11 |
| Season 6 | October 1965 | October 1995 | 17 |
| Season 7 | June 1966 | September 1966 | 12 |
| Season 8 | May 1967 | June 1967 | 4 |
| Season 9 | September 1968 | January 1969 | 14 |
| Season 10 | September 1969 | June 1970 | 28 |
| Season 11 | November 1970 | April 1971 | 15 |
| Season 12 | October 1971 | May 1972 | 11 |
| Season 13 | November 1972 | April 1973 | 11 |
| Season 14 | November 1973 | May 1974 | 10 |
| Season 15 | October 1974 | December 1974 | 7 |
| Season 16 | October 1975 | December 1975 | 7 |
| Season 17 | December 1976 | September 1977 | 8 |
| Season 18 | December 1977 | March 1978 | 13 |
| Season 19 | September 1978 | December 1978 | 12 |
| Season 20 | October 1979 | March 1980 | 17 |
| Season 21 | October 1980 | April 1981 | 19 |
| Season 22 | October 1981 | March 1982 | 16 |
| Season 23 | October 1982 | March 1983 | 16 |
| Season 24 | October 1983 | January 1984 | 11 |
| Season 25 | October 1984 | January 1985 | 15 |
| Season 26 | October 1985 | March 1986 | 21 |
| Season 27 | October 1986 | March 1987 | 19 |
| Season 28 | October 1987 | March 1988 | 19 |
| Season 29 | October 1988 | April 1989 | 17 |
| Season 30 | September 1989 | September 1990 | 20 |
| Season 31 | October 1990 | March 1991 | 17 |
| Season 32 | October 1991 | April 1992 | 15 |
| Season 33 | November 1992 | May 1993 | 18 |
| Season 34 | October 1993 | March 1994 | 20 |
| Season 35 | October 1994 | March 1995 | 10 |
| Season 36 | October 1995 | March 1996 | 17 |
| Season 37 | October 1996 | April 1997 | 16 |
| Season 38 | January 1998 | April 1998 | 11 |
| Season 39 | October 1998 | April 1999 | 15 |
| Season 40 | January 1999 | March 2000 | 15 |
| Season 41 | October 2000 | March 2001 | 20 |
| Season 42 | October 2001 | April 2002 | 16 |
| Season 43 | October 2002 | September 2003 | 22 |
| Season 44 | October 2003 | March 2004 | 19 |
| Season 45 | September 2004 | July 2005 | 19 |
| Season 46 | August 2005 | August 2006 | 16 |
| Season 47 | October 2007 | August 2008 | 24 |
| Season 48 | October 2008 | July 2009 | 17 |
| Season 49 | January 2009 | April 2010 | 18 |
| Season 50 | September 2010 | March 2011 | 18 |
| Season 51 | October 2011 | April 2012 | 18 |
| Season 52 | October 2012 | April 2013 | 16 |
| Season 53 | October 2013 | April 2014 | 19 |
| Season 54 | October 2014 | April 2015 | 21 |
| Season 55 | October 2015 | March 2016 | 19 |
| Season 56 | October 2016 | March 2017 | 18 |
| Season 57 | September 2017 | April 2018 | 16 |
| Season 58 | September 2018 | April 2019 | 18 |
| Season 59 | September 2019 | March 2020 | 17 |
| Season 60 | November 2020 | March 2021 | 14 |
| Season 61 | February 2021 | April 2022 | 14 |
| Season 62 | January 2023 | April 2023 | 13 |
| Season 63 | January 2024 | April 2024 | 11 |
| Unassigned Episodes | 4 |
| Season | From | To | Episodes |
|---|---|---|---|
| Specials | 0 | ||
| Unassigned Episodes | 1053 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | September 2005 | April 2018 | 40 |
| Unassigned Episodes | 1013 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| Jeff Turner | 10 | 09/24/2017 - 10/22/2017 | |
| Daniel Zuckerbrot | 7 | 02/13/1997 - 03/24/2016 | |
| Ray Burley | 6 | 10/24/1996 - 08/06/2006 | |
| Michael McNamara | 4 | 12/06/2012 - 03/16/2017 | |
| John Bassett | 4 | 11/21/1990 - 10/15/1998 | |
| Scott Harper | 3 | 11/20/2014 - 03/10/2016 | |
| David Springbett | 3 | 01/19/1994 - 11/26/1998 | |
| Jerry Thompson | 2 | 11/12/2015 | |
| Leora Eisen | 2 | 10/29/2015 | |
| Caroline Bacle | 2 | 10/06/2016 | |
| Maureen Palmer | 2 | 01/21/2016 | |
| Mark Starowicz | 2 | 11/03/2016 | |
| Caroline Underwood | 2 | 10/08/1998 | |
| Bryce Sage | 2 | 10/22/2015 | |
| Denis Blaquière | 2 | 06/01/2003 | |
| Jeff Semple | 2 | 01/14/2016 - 03/10/2016 | |
| Andrew Gregg | 2 | 11/19/2017 | |
| Vishnu Mathur | 2 | 11/07/1990 - 10/15/1998 | |
| Judy Jackson | 2 | 11/27/2001 | |
| Kent Nason | 2 | 01/30/2014 | |
| Roberto Verdecchia | 2 | 11/26/2015 | |
| Michael Wadding | 2 | 10/06/2016 | |
| Andrew Nisker | 2 | 03/02/2017 | |
| John Ritchie | 2 | 03/14/2001 | |
| Christine Nielsen | 2 | 01/07/2018 | |
| Michael Parfit | 2 | 01/28/2016 | |
| Teresa MacInnes | 2 | 01/30/2014 | |
| Alison Reid | 2 | 11/05/2015 | |
| Andrew Manske | 1 | 02/25/2016 | |
| Elise Swerhone | 1 | 11/13/2001 | |
| Leif Kaldor | 1 | 02/07/2013 | |
| Tim Hogan | 1 | 03/31/2016 | |
| Leora Eise | 1 | 11/05/2017 | |
| Suzanne Chisholm | 1 | 01/28/2016 | |
| Terry McKeown | 1 | 11/15/2012 | |
| Guilhem Rondot | 1 | 02/11/2016 | |
| Rebecca Snow | 1 | 03/03/2016 | |
| Robin Bicknell | 1 | 01/14/2018 | |
| Nancy Archibald | 1 | ||
| Connie Edwards | 1 | 12/01/2016 | |
| Mort Ransen | 1 | 03/28/2001 | |
| Jean-Francois Méan | 1 | 06/13/2009 | |
| Susan Fleming | 1 | 10/15/2015 | |
| Adam Ravetch | 1 | 04/08/2012 | |
| Ian Herring | 1 | 02/04/2016 | |
| Italo Costa | 1 | 11/27/1991 | |
| Erna Buffie | 1 | 11/13/2001 | |
| Rick LeGuerrier | 1 | 03/31/2016 | |
| Mike Downie | 1 | 10/20/2016 | |
| Heather Cook | 1 | 02/22/1996 | |
| Ryszard Hunka | 1 | 11/26/2017 | |
| Rick Rosenthal | 1 | 01/07/2016 | |
| Ian Lagarde | 1 | 06/13/2009 | |
| Michael Allder | 1 | 09/09/2007 | |
| Rocky Collins, Michael Burke | 1 | 11/20/2001 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| Amanda McConnell | 2 | 02/15/1996 | |
| David Suzuki | 2 | 11/15/2012 | |
| Allan Bailey | 1 | 11/07/1990 | |
| Siobhan Flanagan | 1 | 10/15/2015 | |
| Leonard Gilday | 1 | 11/13/1991 | |
| Peter Shatalow | 1 | 10/19/2005 | |
| David Murray | 1 | 03/10/2016 | |
| Mark Johnston | 1 | 11/05/2015 | |
| Leslea Mair and Leif Kaldor | 1 | 02/07/2013 | |
| Liam O’Rinn | 1 | 03/31/2016 | |
| Allen Booth | 1 | 03/03/2016 | |
| Helen Metella | 1 | 12/01/2016 | |
| Helen Slinger | 1 | 01/21/2016 | |
| Maija Leivo | 1 | 02/04/2016 |
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