diff --git a/h2/components/modules/mod_graph.R b/h2/components/modules/mod_graph.R
index 2dafd88..f0e2080 100644
--- a/h2/components/modules/mod_graph.R
+++ b/h2/components/modules/mod_graph.R
@@ -5,7 +5,10 @@
 
 graph_ui <- function(id) {
   ns <- NS(id)
-  fluidRow(actionButton(ns("plot"), "Plot"),
+  fluidRow(selectInput(ns("variable"), "Select a variable to plot:",
+                       c("Global Temperature at Surface" = "global_tas",
+                         "CO2 Concentration" = "CO2_concentration")),
+           actionButton(ns("plot"), "Plot"),
            plotlyOutput(ns("graph")))
 }
 
@@ -14,7 +17,7 @@ graph_server <- function(id, r6, i) {
     observe({
       if (r6$save == TRUE) {
         filtered_output <-
-          filter(r6$output[[r6$i()]], variable == "global_tas")
+          filter(r6$output[[r6$i()]], variable == input$variable)
         
         output$graph <- renderPlotly({
           plot_ly(
@@ -38,7 +41,7 @@ graph_server <- function(id, r6, i) {
       }
       if (r6$save == FALSE) {
         filtered_output <-
-          filter(r6$no_save, variable == "global_tas")
+          filter(r6$no_save, variable == input$variable)
         
         output$graph <- renderPlotly({
           plot_ly(
@@ -55,12 +58,12 @@ graph_server <- function(id, r6, i) {
           ) %>%
             layout(
               xaxis = list(title = "Year"),
-              yaxis = list(title = "Global Temperature (C)"),
-              title = "Global Temperature at Surface"
+              yaxis = list(title = input$variable),
+              title = input$variable
             )
         })
       }
     }) %>%
-      bindEvent(input$plot)
+      bindEvent(input$plot, ignoreNULL = FALSE, ignoreInit = FALSE)
   })
 }
\ No newline at end of file
diff --git a/h2/components/modules/mod_run.R b/h2/components/modules/mod_run.R
index d4570ef..62d77a1 100644
--- a/h2/components/modules/mod_run.R
+++ b/h2/components/modules/mod_run.R
@@ -18,7 +18,7 @@ run_ui <- function(id) {
                 selected = "input/hector_ssp245.ini", inline=TRUE,
                 shape = "square", width = "80%"),
     sliderInput(ns("start"), label="Select dates:",
-                min = 1750, max = 2300, value = c(2000,2300), sep="", width = "90%", step=5),
+                min = 1750, max = 2300, value = c(1900,2100), sep="", width = "90%", step=5),
     # sliderInput(ns("end"), "Select end date:",
     #             min = 1750, max = 2300, value = 2300, sep="", width = "90%"),
     br(),
@@ -108,6 +108,6 @@ run_server <- function(id, r6, i) {
       
       #updateMaterialSwitch(session = i, inputId = "savetoggle", value = FALSE) #not working right now
     }) %>%
-      bindEvent(input$run, ignoreInit = TRUE)
+      bindEvent(input$run, ignoreNULL = FALSE, ignoreInit = FALSE) # runs when app opens
   })
 }